Why does the battery light come on after the alternator is replaced?

This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.

Can you test the battery with an alternator?

Click to expand… That’s battery cable trick. When cars had generators you could test the generator by running the car with the battery disconnected. It’s different with an alternator and with todays cars. You can spike the electronics very easily.

Is the alternator good in a 2002 Dakota Durango?

Battery good, Alternator Good, gauge shows low voltage. I have a 2002 4.7 Dak with 118k miles, never replaced anything besides battery and oil changes. Never have had any problems until now. It started with my check gauges light coming on and I noticed my battery gauge went all the way to the L.

Where is the battery gauge on a car?

Find the ammeter on the dashboard. The ammeter gauge should read a little greater than zero when the engine is on and the system is functioning properly. This means that the battery is fully charged and the charging system is providing the current.

What’s the battery gauge on my Chevy Silverado?

Yesterday it had not flickered at all when turning the key to start. But, yesterday the battery gauge went to 0 when trying to start. Today it went down just a bit while cranking, went to 0 for a half second, and jumped back up to 14 when it started.

Where is the green wire on an alternator?

Connect one to a paint-free point on the engine, and the other one to the green wire. Actually, you can use either small terminal on the back of the alternator. The resistance between those two terminals is only four ohms, but be aware, it is common for them to read open circuit when the rotor is not spinning.

Is the alternator charging at 18 volts or 23?

Alternator charging at 18 volts, replaced alt and didn’t fix. Have read some other answers on similar problems, blue wire reads 18 volts, green wire reads.23 volts? have the same problem?

What to do if your alternator is overcharging?

To verify this, with the ignition switch off, connect your ohm meter with small jumper wires so you don’t have to hold onto the probes. Connect one to a paint-free point on the engine, and the other one to the green wire. Actually, you can use either small terminal on the back of the alternator.

Is there a problem with the Chevy running light?

The Chevy daytime running light problem is a far-reaching one. For more than a decade mechanics have been replacing melted factory installed sockets and bulbs. We’ll also discuss ambient light sensor problems in this article.

What causes an alternator to stop working on a car?

Once the alternator stops working, so do all of the electrical systems required to keep a car going. Other problems can also cause a car to not start. It could be a bad starter, corroded cables, or a broken connection somewhere between the battery and starter.

When do you need to replace your running lights?

They also increase your road vision during sunrise and sunset. If something goes wrong with your daytime running lights, they should be fixed immediately. Whether your vehicle uses high beams or has a separate light assembly for the daytime running lights, the troubleshooting process is the same.

What are the symptoms of a bad alternator in a GMC Sierra?

Here are the most common symptoms of a bad alternator in a GMC Sierra: The battery light is designed to tell you that there is not enough voltage to properly charge the battery, or that the battery itself is not holding the proper voltage. In rare occasions the service engine soon light may light up.

Why are the lights flickering on my GMC Sierra?

Keep in mind that some minor flickering is normal and is due to the changes in output voltage of the alternator as controlled by the PCM. This vehicle had a swing in voltage of up to .8 (eight tenths) of a volt. That is not normal.

What does it mean when an alternator light comes on?

If the light illuminates only intermittently, it usually indicates a loose or worn drive belt or serpentine belt, worn-out or bad carbon brushes in the alternator. But remember that the light doesn’t always mean there is a bad part; the light may be triggered by a sensor giving a wrong message or there’s something wrong with the circuit itself.

Is the alternator on every GM car the same?

I say flaw, actually every GM vehicle of the era was wired exactly the same so I’m not sure exactly why our coaches are more susceptible to have a problem here but it looks like we do.

This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.

What was the problem with my alternator going out?

I was thinking that the problem was probably the alternator and as I was trying to get to my house the instruments began to go out. First the tach, then the speedometer, and then the accelerator pedal was unresponsive. I was able to limp for a little while, but it eventually totally quit.

What happens to power steering after an alternator is replaced?

Usually when brakes pads are replaced and the rotors surfaced, it may make the brakes feel stiff for a while until they wear in, but it shouldn’t impact the power steering at all. The only thing I could think of… Engine sludge?

How can I tell if my alternator or battery is OK?

As with most electrical issues, if you know the battery or alternator is OK (because you had it tested), then diagnosis comes down to tracing and testing for continuity from one portion of the circuit (s) involved to the next.

Is the battery voltage on both sides of the alternator?

If you clear the codes and the warning comes back lets make sure the fusible links have power on both sides. Here is a guide and the alternator wiring diagrams to help you test and see how the system works. Check the two fusible links in picture they should have battery voltage both sides. The problem may be the PCM but lets run some tests first.

How to troubleshoot an alternator and charging system problem?

If necessary, adjust the belt with the help of your car owner’s manual or repair manual. Inspect the belt for signs of cracks, cuts, shiny spots, deterioration or other signs of wear or damage. Change the belt and belt tensioner at the manufacturer’s recommended interval. 2. Check for Wiring Problems

Why does the battery light still come on after changing the alternator?

Will the battery light still come on if the battery (factory original by the way) is starting to go bad…maybe the bad alternator (if it was bad) weakened it? Or does the battery light need to be reset after changing out the alternator? Any help would be greatly appreciated.

Do you need a battery for an alternator?

Honestly, you need a battery, but perhaps just a charge will get you by. A weak battery will cost you an alternator (oh yeah, you just bought one) it can cost you a starter and it can cost you a computer.. Charge the battery (FULL charge) and then have them check it.

How can I tell if my alternator has a blown fuse?

The easiest way to look at the alternator is to check voltage at the battery. See what DC volts is and check for A/C voltage at the battery (meaning alternator isn’t converting voltage properly). Also check the amperage as well. My guess is you have a blown fuse.

Are there 2 fuses for the IIRC alternator?

IIRC there are 2 fuses for the alternator (will check my diagram later). If your fuse check comes back fine, you likely have either a cluster problem or wiring problem. The easiest way to look at the alternator is to check voltage at the battery.

What should I do if my alternator keeps dying?

The alternator is essentially a generator and it keeps your battery charged while supplying additional electrical power for the other systems in the vehicle. If you have a new alternator and your battery keeps dying on you, then there’s definitely a problem that you’re going to need to look into.

Can a car battery be drained by an alternator?

While you might initially think that any problems with electrical things like lights or radio not working are directly related to the battery, the alternator is actually where most of the power in your vehicle comes from. Consider that if you were to leave the lights of your car on overnight by the next day your battery might be drained completely.

How can I tell if my alternator is working or not?

If you’re not 100% sure, you can use a multimeter, or a voltmeter, to check the current coming from your battery. Attach the positive lead to the positive battery terminal, that’s the red one, and then the negative leave it to the black terminal. With the engine off you should be getting a reading of 12.5 volts on your multimeter.

What should the charge voltage be on an alternator?

Turn on the high beams for 10 seconds and then turn them off. Measure battery voltage across the battery posts with your DMM. You should get between 12.4 and 12.6V. This means your battery is fully charged. If you get a reading below 12.4V, charge the battery before continuing. 5b. Measure the Charging System’s No-Load Voltage

What happens when the diodes in an alternator go bad?

Alternators use diodes to rectify alternating current produced by the alternator into direct current. When one or more diodes go bad, the alternator can cause all kinds of problems. AC voltage leak can cause your lights to dim and drain power from your battery, for example.

What happens if you have a bad alternator in your car?

But if you have a bad alternator, then it won’t be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge. Once the alternator completely dies, the power that is left in the battery will be exhausted in a matter of minutes.

How does an alternator affect the charging system?

The alternator is at the heart of the charging system of your vehicle. Alternator problems and charging system problems can affect your vehicle in different ways. You may notice: your ALT or CHARGE indicator light comes on, your engine is hard to start and cranks slowly, or doesn’t crank, your battery demands lots of water,

What happens when the check charging system light comes on?

What’s happening when the battery/check charging system light comes on? Whenever this light goes on, it means that the vehicle is running solely on battery power. If the problem continues and your charging system fails, the battery won’t be able to recharge and it will soon run down, leaving you with a dead battery.

What causes the battery light to go out?

Click to expand… Many charging systems put the alternator energizer wire through the light bulb. When the alternator starts charging positive voltage is equal on both sides of the bulb filament and the light goes out.

Why would a good alternator not charge a battery?

The alternator is powered by several different wiring mechanisms. If a wire is not attached properly, becomes detached or is inadvertently cut, the alternator will not have any power. If the alternator is not getting any power, it cannot turn the pulley and belt mechanism that charges the battery, and the battery will not charge.

How do I know if my battery or alternator is bad?

Signs of a bad alternator. If the above steps reveal that the battery is working, it’s time to take a closer look at the alternator. There are certain signs of a bad alternator to look for: While running the car, note the brightness of the interior lights. If the dashboard gradually dims, the alternator is likely at fault.

Will a car with a bad alternator start with a new battery?

A bad alternator can prevent a car from starting because it did not charge the battery when the car was running. However, even if you have a dead battery because of the alternator, you can still jump-start the car using the following method.

Why does your battery light keep coming on?

There are a few different reasons why your vehicle’s battery light came on. It could be a problem with your alternator, which recharges your battery while your engine is running. It could also be a wiring issue such as a damaged or disconnected wire affecting your battery.

Why does the battery light come on and off?

Last week while driving, for about 3 seconds the battery light flickered on and then off. The voltmeter jumped up and down between high and low. Two days ago, the battery light appeared again and this time it stayed on. The meter kept low and then started dropping lower and lower.

Why does my car battery keep going dead?

A common reason for a dead car battery is that it’s been drained by the lights being left on, without the engine running. If your battery hasn’t completely discharged, you may be able to charge it using a car battery charger that plugs into the mains.

What to do if your car battery has run out?

If your battery hasn’t completely discharged, you may be able to charge it using a car battery charger that plugs into the mains. We sell a range of these, so keep one in your garage and you’ll always be prepared for when a flat battery strikes! However, if your battery has totally run out, it’s likely that simply charging it won’t work.

When does a car battery light come on?

If your car battery is on the verge of death, it will cause your car light to come on at any time. Even though car batteries are sold as having warranties at different lengths (ie: 48, 72, or even 96 months), don’t expect them to last that long… they rarely do.

What to do if your battery light comes on again?

Tip: Try starting your car in a safe location, if the battery light comes on again, do not drive it. Shut off the engine and open the hood to see whether the serpentine belt, alternator or battery have any problems that can be identified visually. Tip: Always turn off the engine before inspecting the battery or other components.

What happens if your car battery goes out?

This battery provides energy to virtually every electrical component of the vehicle, such as its ignition system, engine control unit, headlights, radio, interior lights, and so on. If the battery fails to recharge or dies altogether, then your vehicle will not be able to function.

What happens when you change the battery in a car?

A relatively common “side-effect” of replacing a battery and/or alternator in a car is to have the voltage (battery) warning light come on. This is especially true in late-model vehicles with their more sophisticated internal diagnostic systems. There are usually two things…

What to do if your car battery light is not working?

Get the alternator or wiring fixed, and properly recharge the battery at the same time. The folks at AutoZone can always help with battery and charging system issues, both on the car, and with the parts off the car.

Why does the battery warning light keep coming on?

If you drive more than twenty or thirty minutes battery light comes on and stays on. After another few minutes all warnings lights flash and all gauges freeze, then power steering goes out and car dies completely. Had new alternator tested and its fine just put new battery in. Do not know what else to do.

Why does the battery warning light stay on?

The warning light for the battery will stay on if a fault is detected in the charging system . If this occurs, there are a number of potential causes to check out when troubleshooting. Safety is important whenever working with electrical systems, so check your owner’s manual for general tips.

How do I know if it’s the battery or the alternator?

Check the Alternator. Test the alternator to make sure that it can start up the battery. If the battery is working properly and nothing is wrong with it, then it’s the alternator that will more likely cause a problem. Try to start the engine and listen carefully, if it produces a “whining” sound, it may be the alternator.

How long can a battery last without an alternator?

A good alternator and can last well over a decade, sometimes as long as 15 to 20 years. However, if an alternator does fail on you then you’ll know it fairly quickly as your electrical systems will fail soon afterwards. The charge in your battery does not last long without the alternator there to keep it running properly.

What happens if you have a bad alternator on a Honda Civic?

As described above, a bad alternator will drain your Civic’s battery fast. When the battery gets so dead it will no longer be able to power your Civic’s ignition system. As the ignition system is no longer able to produce a full powered spark, the engine will begin to sputter and stall.

What are the symptoms of a bad alternator?

BAD ALTERNATOR SYMPTOMS: 1 Dim lights. The failing alternator symptom most drivers recognize is dim or flickering lights. 2 Service engine light. Another obvious sign is the one your vehicle tries to tell you. 3 Odd noises. 4 Electrical issues. 5 Engine stalling. 6 Dead battery.

What to do when your alternator stops working on your car?

After running the motor for a while, turn the car off. If you can’t get it to restart, this is a sign the alternator is doing its job of keeping the battery working while the motor is running, but the battery isn’t retaining the charge when the alternator has stopped. The car battery could be old.

What should the voltage of an alternator be?

This time it should be at least 14.2 volts if the alternator is healthy and charging the battery. If voltage is good, turn on the headlights, interior lights, radio, heater and any other electrical load. The meter should still display above 13 volts.

When do people hear that they have to replace an alternator fuse?

When people hear that they have to replace an alternator fuse when they have an alternator fuse blown in their car, they sometimes start to panic. It sounds like it would be a pretty expensive job, doesn’t it? But the truth is that the average car fuse is only going to cost you $20 or so, if that.

What should I do if my alternator is not working?

The solution is to check your car’s manual for the particular fuse that controls the alternator and replace it. In some cars, you might also find another small fuse to the alternator’s control—usually a 15A to 20A fuse. An alternator does usually has 3 or 4 wires to it to function properly.

What happens when the alternator of a car is dead?

The alternator and the car’s battery work hand in hand. A good battery should give you service for the next five years before its lifespan ends. If your battery is dead, then it will not give power to the car’s alternator. The alternator normally lasts longer than the battery.

Why is there a noise coming from my alternator?

Noise from the alternator could be caused by a faulty rotor shaft, rectifiers, bearings, slip rings, stator winding or brushes. You will need to carefully inspect each of these components and replace them. One sure way of confirming that the noise is coming specifically from the alternator is to use a vacuum hose.

Why do my dash lights come on on the way to work?

G’day, my dash lights (fuel, cooling, brakes) all came on this morning on the way to work as it seems is typical of a charging issue . I am wondering if this is caused by a faulty alternator or charge relay.

Why is my alternator making noise on the radio?

It goes away if they shut down the alternator in flight. We have tried hooking up a “noise filter” to the radio with zero improvement. The alternator is charging fine, and tests fine. Both are home builts, one is a RV-4 and one is a Pitts. Any thoughts from the avionics gurus? Always look for poor grounds first. Alternator case to engine.

What’s the battery voltage on a Honda Pilot?

Voltmeter shows across battery terminals: 14.2 V when engine is running; 12.8V when engine not running. Any suggestions as to my problem?? My symptoms seem very similar to first poster.

What causes a battery light to come on after an alternator is installed?

The most common is, again, a loose connection either with the control plug (aka “relay” plug-in), charging line connection, or the ground. The other is a blown fuse or defective connector or relay, which could have been broken or shorted when the alternator was installed or on the first start-up after its installation.

How to reset my Honda radio after putting in a new battery?

Step 1 Turn the ignition key to the “On” position, but don’t start the engine. Turn the radio on by pressing in on the volume control knob. After 10 seconds, turn the radio off. Press and hold the power button for two to five seconds and watch the radio display. Release the power button when the display lights up and the radio turns on.

Is it safe to test an alternator without a battery?

The alternator is a fundamental piece of the electrical system on your vehicle. Without it, your battery will very quickly run out of charge, and your car won’t start. Testing your alternator with the battery disconnected is not a safe method, and may damage your vehicle. In this brief article, we show you how to safely test your car alternator.

How to test your alternator with a multimeter?

Step-by-step guide to testing your alternator with a multimeter: Make sure your battery is fully charged. Use a modern trickle charger to ensure your battery is in the best condition possible. With the engine off, connect a multimeter to the battery terminals. Black to black, and red to red.

What is the code for Honda hybrid battery overheating?

Code P1449 is for the hybrid battery overheating. Honda has issued a TSB 04-028 for this issue. You will have to take your car to the dealer, since the high voltage battery must be accessed for repair. Honda has…

Why does my alternator not charge my battery?

If your vehicle is losing battery voltage (i.e. your battery light is on) the problem may be your battery. You have a new alternator, so if your battery is bad, it won’t hold the charge from the alternator. The problem could still be a defective alternator or improper installation. A fuse could also be the cause.

Why does my alternator cut off while driving?

I just had the alternator replaced, but my car cuts off while driving. If your vehicle is losing battery voltage (i.e. your battery light is on) the problem may be your battery. You have a new alternator, so if your battery is bad, it won’t hold the charge from the alternator.

What does the amber ESC warning light mean?

If the amber ESC warning remains lit, it means there’s a fault with the system. ESC uses ABS sensors and can often be the cause of fault. If the ESC light flashes, it means the system is operating. The amber steering wheel / exclamation mark is the electronic power steering (EPS) fault light.

What does the EPB warning light on Hyundai Tucson mean?

The Hyundai Tucson EPB warning light means there’s a fault with the Electronic Parking Brake. If the EPB warning light illuminates along with the ESC warning light, it does not mean the EPB has malfunctioned. and where the vehicle is actually going.

What happens when an alternator has an electrical problem?

After the engine starts (thanks to the high voltage provided by the battery), the alternator provides the electricity required to power the car’s many electrical functions, including the lights and radio, the spark, charging the battery, and others. What Happens When Your Car Has an Electrical Problem?

When does the EPB malfunction indicator come on?

The EPB malfunction indicator may illuminate when the ESC indicator comes on to indicate that the ESC is not working properly, but if this occurs, it does not indicate malfunction of the EPB. This warning light illuminates when the AEB system is turned off or when the radar sensor or cover is blocked with dirt or snow.

Is the alternator at the heart of the charging system?

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology. The alternator is at the heart of the charging system of your vehicle. Alternator problems and charging system problems can affect your vehicle in different ways.

Can a bad car battery cause an alternator to not charge?

In theory a car can run only with the alternator charge, but this can cause heavy voltage spikes and other strange symptoms so this means that a bad car battery can cause an alternator to not charge also. Cars are increasingly coming with modern electronics.

What is the function of an alternator in a car?

The main function of the alternator is to power the car’s battery. When your AC, headlights, and stereo are on, a lot of power is needed. The battery cannot supply all this power on its own, hence the need for the alternator. The alternator converts mechanical energy into electricity.

What happens when you buy a new alternator?

The mechanic went out of their way and bought a different alternator from a different vendor; installed it and the same problem happened. It would start after a jump then putter out moments later.

What does a car battery and alternator do?

What the Battery & Alternator Do. An auto battery supplies a big electric charge that travels through the starting system and turns some gears to start the car. Once the car is running, the alternator sends current back to recharge the battery as you drive.

Why is the alternator not working on my car?

It may have damaged your battery. Since the alternator regulates how much electric current gets fed back to the battery during recharging, the battery may have overheated due to overcharging. This shortens its expected life and can make it unreliable.

How to replace auxiliary battery in a BMW 330e hybrid?

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Why is the battery light not turning on?

A weak battery or working charging circuit won’t turn on the battery light. Since you pretty much ruled out the alternator I would make sure to check your fuses. IIRC there are 2 fuses for the alternator (will check my diagram later). If your fuse check comes back fine, you likely have either a cluster problem or wiring problem.

What are signs of needing a new alternator?

Warning Light. Many automobiles have a battery or alternator warning light on the dashboard.
Load Test. Conducting a load test will indicate whether or not your alternator needs to be replaced.
Voltmeter Test. You can test your charging system with a voltmeter.
Other Signs.

Why is your new alternator not charging your battery?

The most common reason for an alternator not charging a battery is because of a bad alternator or battery . You can easily test the voltage by connecting a voltmeter to your battery while the engine is off.

Why is my alternator not charging the battery?

If the alternator is not charging the battery you will have a red “ALT” or “charge” sign on your dashboard. This means that your battery is no longer being supplemented for power by the alternator. You will need to recheck the wiring because the light could also be faulty. Nov 22 2019

What does it mean when your alternator is not charging?

If the alternator is not charging the battery, you will have a red “ALT” or “charge” sign on your dashboard. This means that your battery is no longer being supplemented for power by the alternator. You will need to recheck the wiring because the light could also be faulty.

How can I tell if I have an alternator problem?

To differentiate an alternator problem from the battery, you will need to use a voltmeter to check for voltage. First, turn off the engine and check the battery voltage. A fully charged battery should have a reading of 12.65 volts. Next, turn on the engine and recheck the voltage. You should have a reading of 13.5 to 14.5 volts.

The mechanic went out of their way and bought a different alternator from a different vendor; installed it and the same problem happened. It would start after a jump then putter out moments later.

Is there a problem with the alternator in Liberty?

Discussion in ‘ Liberty ‘ started by jonahb1987, Jul 10, 2019 . I recently had a breakdown. At first we thought it was the alternator, so I bought a new one. Had it installed at a mechanic and the same problem would happen. After being jumped, it would start but putter out in like 4 minutes.

Is the new battery and alternator testing good?

New battery and alternator testing good. Why? My battery light came on awhile ago, so I replaced the battery. It now will come on every and now and then. Just randomly I will be driving and it will come on and then a minute later go off. I have got alternator tested at Autozone and they said it was good. I have also tested it myself.

If you’re not 100% sure, you can use a multimeter, or a voltmeter, to check the current coming from your battery. Attach the positive lead to the positive battery terminal, that’s the red one, and then the negative leave it to the black terminal. With the engine off you should be getting a reading of 12.5 volts on your multimeter.

Why does the alternator light come on in a Peugeot?

But if the problem continues the battery and alternator will need to be checked and repaired. Why does a Peugeot Partner’s alternator light come on intermittently and some systems stop working? The alternator light indicates that the battery is not being charged.

What should I do if my alternator fails?

If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system. If the alternator fails, replace it with a new or rebuilt unit and re-test system, if the alternator tests ok proceed to the next step.

How long does an alternator and battery last?

As a battery ages it loses its ability to hold a charge, as a rule of thumb a battery will last about three to four years. If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system.

How much does it cost to replace an alternator in a car?

If you have an awesome audio system, odds are you’ll need a more expensive alternator that puts out more amperage for your car’s electrical needs. In general, expect $130 to $250 for a quality alternator.

Honestly, you need a battery, but perhaps just a charge will get you by. A weak battery will cost you an alternator (oh yeah, you just bought one) it can cost you a starter and it can cost you a computer.. Charge the battery (FULL charge) and then have them check it.

Symptoms of a Bad Alternator: Jeep Liberty 1 Battery Light. The battery light is designed to tell you that there is not enough voltage to properly charge the battery, or that the battery itself is not holding the 2 Dead Battery. 3 Stalling Engine. 4 Bearing Noises. 5 Dim headlights. 6 Electric Accessory Issues.

Discussion in ‘ Liberty ‘ started by jonahb1987, Jul 10, 2019 . I recently had a breakdown. At first we thought it was the alternator, so I bought a new one. Had it installed at a mechanic and the same problem would happen. After being jumped, it would start but putter out in like 4 minutes.

What happens if you have a new alternator and the battery is not charging?

The alternator in your car is an integral part of your vehicle’s electrical system. If you have a new alternator and the battery is still not charging, then you definitely have some kind of a problem with your battery that you’ll need to address immediately.

Why does the battery warning light come on?

The battery warning light in most cars indicates there is problem with the charging system as a whole, not just the battery. It sounds to me like you have a problem with your alternator. The airbag computer will set a code and turn on the warning light when the system voltage is too high, or too low.

Is there a problem with the battery voltage?

Check the two fusible links in picture they should have battery voltage both sides. The problem may be the PCM but lets run some tests first. Check out the diagrams (Below). Please let us know what you find. helpful? Although I appreciate for your reply I’m not sure I understand.

How do you check the battery light?

To check the battery charge, press the battery status button and look at the color of the status light. Here’s what the lights mean: *If your battery has no charge, you can charge to 80% in about two hours and 100% in about four hours.

Why does the battery warning light come on after replacing the alternator?

A relatively common “side-effect” of replacing a battery and/or alternator in a car is to have the voltage (battery) warning light come on. This is especially true in late-model vehicles with their more sophisticated internal diagnostic systems.

How to diagnose an alternator or electrical problem?

Diagnosing alternator problems can be a bit tricky because the electrical system in a car comes from two places, the battery and the alternator. I’ll give you a little background so you can understand what both systems do. The battery has one primary function, which is to start the car.

The car won’t start at all. If the problem is a bad alternator, your car will slowly lose power. You’ll be driving down the road, your lights will dim, and you’ll lose power and die. If the problem is with your battery, then you’ll generally only have trouble starting your car since that’s the battery’s main function.

How much does it cost to replace an alternator?

Alternator Prices and Installation. Make sure that your current alternator is beyond repair first before getting a new one. Alternator prices can vary greatly by make and model, but generally speaking, new alternators should run around $250 without labor for installation.

When do you need to repair or replace an alternator?

Your problem may be a worn or defective belt or a battery that is at the end of its life. If it is the alternator that is defective, then you must repair or replace it. Buyers are sometimes confused by the three “Rs” when it comes to getting an alternator fixed: repaired, rebuilt and remanufactured.

But if you have a bad alternator, then it won’t be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge. Once the alternator completely dies, the power that is left in the battery will be exhausted in a matter of minutes.

What causes the alternator warning light to flash?

An alternator that is on its way out may cause this warning light to flash when there is a high demand on the battery. You can always save yourself a lot of trouble by paying attention to warning signs like this and trying to conserve your car’s battery.

What should voltage be for car battery light?

It’s relatively easy to check the function of the alternator with a multimeter. The voltage should be between 13.6 volts and 14.6 volts. If the voltage is less than 12 volts, the battery light is triggered and you’ll likely need to replace the alternator.

Why is the battery light on on my 4.6L?

Broken wire coming off the alternator. It may not look broken but it could be broke inside the insulation. That was the story with my 4.6L. The battery light would come on and off, wiggled the single grey wire and it would turn the light on and off.

What causes a car battery light to illuminate while driving?

As you know, the alternator is responsible for keeping the battery fully charged as you are driving the vehicle. But if you have a bad alternator, then it won’t be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge.

When to replace the alternator on a Kia Sorento?

If you got 14.2 or more volts, the alternator is charging fine. If it’s still showing in the 12’s, it’s time to replace the alternator. If it’s producing a voltage level in the 13’s, go ahead and take it into a parts store and have it tested.

Can a bad alternator cause a car to not start?

Once this battery reserve hits a certain level, the vehicle will begin to run erratically and will no longer start when the key is turned. Often, the battery light will come on, the alternator gets replaced, and then a few days later the vehicle dies.

What happens when the battery dies on a Kia Sorento?

When the battery gets so dead it will no longer be able to power your Sorento’s ignition system. As the ignition system is no longer able to produce a full powered spark, the engine will begin to sputter and stall.

Click to expand… Many charging systems put the alternator energizer wire through the light bulb. When the alternator starts charging positive voltage is equal on both sides of the bulb filament and the light goes out.

Diagnosing alternator problems can be a bit tricky because the electrical system in a car comes from two places, the battery and the alternator. I’ll give you a little background so you can understand what both systems do. The battery has one primary function, which is to start the car.

How long does it take to install an alternator?

If you need to have it installed by the mechanic, then the price might be a bit higher. Depending on where your alternator is located within the compartment, the installation might only take an hour. But if the alternator is difficult to access, it might require removal of other parts and it could take many hours.

What to do if your car won’t start but Lights Come On?

If the battery is dead and not working correctly, you will need to get a replacement or repair the battery. Sometimes, you need to decide if it is better to repair or replace the battery depending on your car’s value, and the cause of the “car won’t start, but lights come on” situation.

What is the smell of a bad alternator?

Smell of Burning Rubber. The scent of burning rubber or scorched wires sometimes indicate an alternator failure. Friction between a misaligned belt and the pulley will emit a smell of burning rubber.

When to go to the mechanic for an alternator problem?

In the event that tightening the belt does not resolve the smell or increase your alternator output then it is time to visit a mechanic. Your local AAMCO Minnesota location can diagnose and repair your electrical system, including your alternator. The alternator is responsible for recharging your car’s battery.

What happens when the belt on an alternator breaks?

A closer observation of the alternator will reveal a pulley and belt system that works to convert mechanical energy into electrical energy. The serpentine belt powers the alternator, and if it fails, the alternator will stop working the moment your belt wears out and breaks, or the pulley becomes damaged.

What should I do if my alternator is making noise?

If the alternator bearing noise are the only problem, then you can save a boatload by replacing bearings yourself, as I described in an earlier section. You can find an alternator rebuild kit for about $25-$35, which will include the bearings you need.

Is it time to replace your alternator or battery?

If so, it’s time to replace it. Some may recommend running the engine with the negative battery cable disconnected to test the alternator. However, this is not a good idea because it could damage the electrical system of your vehicle and cause greater problems. Fixing your battery or alternator can be an expensive repair.

The alternator and the car’s battery work hand in hand. A good battery should give you service for the next five years before its lifespan ends. If your battery is dead, then it will not give power to the car’s alternator. The alternator normally lasts longer than the battery.

If the alternator is not charging the battery, you will have a red “ALT” or “charge” sign on your dashboard. This means that your battery is no longer being supplemented for power by the alternator. You will need to recheck the wiring because the light could also be faulty.

A weak battery or working charging circuit won’t turn on the battery light. Since you pretty much ruled out the alternator I would make sure to check your fuses. IIRC there are 2 fuses for the alternator (will check my diagram later). If your fuse check comes back fine, you likely have either a cluster problem or wiring problem.

Is the battery still on after a new battery?

I chanced it when I needed a new alternator, I got a new alternator from Advance Auto, their Carquest 130 amp one, and it is working fine so far, but has a lifetime warranty. One thing when testing alternators is many times they will test fine for the short test when cold on the test bench, but when hot they won’t charge worth a darn.

How to remove an alternator from a Ford Escape?

An easier way to remove and install the alternator on a V6 ford escape and V6 mazda tribute. – YouTube An easier way to remove and install the alternator on a V6 ford escape and V6 mazda tribute.

Why is my alternator not working on my Mazda Tribute?

If playback doesn’t begin shortly, try restarting your device. My intention of this channel is to inform people of things that they can’t find normally, and hopefully entertain you.

Do you need to put your alternator back on?

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Why do I need an alternator in my car?

It must supply enough electrical energy to the battery for recharging, along with maintaining sufficient voltage to run the vehicle’s accessories and components. Original factory alternators come fine-tuned from the factory to meet the precise needs of the vehicle’s electrical demands, including charging level and intensity.

How does an alternator control the voltage of the battery?

Newer alternators have computer controlled regulating devices. One such design uses a “temperature compensated” computer sensor. The sensor dictates the amount of voltage an alternator puts out depending upon the temperature. Hot batteries demand less voltage, whereas cold batteries require more voltage.

What should I do if my alternator overcharges?

The older type of fender-mounted regulator and a newer alternator that has the regulator inside of it will show the same types of overcharging symptoms. Newer alternators have computer controlled regulating devices. One such design uses a “temperature compensated” computer sensor.

An easier way to remove and install the alternator on a V6 ford escape and V6 mazda tribute. – YouTube An easier way to remove and install the alternator on a V6 ford escape and V6 mazda tribute.

What is the fuse box diagram for a Mazda Tribute?

Left/Right Turn Indicators, Left/Right Front Side Turn Lamps, Left/Right Front turn Lamps, Left/Right Rear Turn Lamps, Left/Right Trailer Turn, Flasher Unit Left/Right Stoplamps, Hight Mounted Stoplamp, Left/Right Trailer Stoplamp, ABS Unit, ASC Unit (Brake Pedal Position Switch), PCM, Shift Solenoid

Is the ground fine going to the alternator?

Yes the ground is fine going to the alternator, both battery terminals are cleaned on both ends. At the connector level at the alternator no residue, plug looked fine. On very first event 3 weeks ago, the very first sign of battery being lit up at higway speed, I had both battery terminals with green deposit.

Can a dead battery be a problem with the alternator?

A dead car battery can be one of the first indicators of a problem with the alternator. If you’ve confirmed the battery is working properly after reading the section above, then the safest conclusion to make is the issue is related to the alternator. There are a few ways to test this to verify a problem:

What should the voltage be on a new alternator?

The wait time was 1 day. I installed the new alternator myself and went back to AutoZone to test it. Again, getting the same error “VOLT REG FAILED”. I also ran across a Haynes vehicle manual that states that the voltage should be around 13.5 V – 15 V, but it is not always this way.

How often does an alternator need to be replaced?

An alternator typically lasts for 8-12 years, so it isn’t something that has to be replaced as often as other parts like the battery. If your alternator fails, your battery will lose its charge since the alternator won’t be able to keep it charged up. A dead battery is your initial sign that something could be wrong with the alternator.

A dead car battery can be one of the first indicators of a problem with the alternator. If you’ve confirmed the battery is working properly after reading the section above, then the safest conclusion to make is the issue is related to the alternator. There are a few ways to test this to verify a problem:

How often should I replace my car starter?

The best place to start your investigation is with the battery. Typically lasting 3-5 years, the battery is many times the part that has failed. The easiest and cheapest of the three parts to replace, without a fully charged battery your starter won’t work properly. For more information on troubleshooting battery issues, check out this article.

How can you tell if your alternator is failing?

There may be a few signs prior to failure that are worth noting. You will likely hear a growling sound, smell burning rubber inside of your car, or you may notice lights dim or brighten significantly. If you suspect your alternator is failing, check out our Car Brake Services page for more information.

Is it OK to change the battery in a Mercedes Benz?

You will be ok to drive the car, but replace the battery as soon as you can before it is not going to last very long. Mercedes uses battery group 49 and you want to save some $$$ you can get a AGM battery which is what the dealer uses for less on Amazon. Here is a highly rated battery on Amazon that will fit Mercedes Benz cars. 2.

When do I get battery / alternator VISIT WORKSHOP warning?

Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12.6 volt. When the car is running the alternator produces electricity and the voltage should be above 13.5 volt.

How can I tell if my alternator needs to be replaced?

First check the battery voltage to confirm if it’s the alternator. If it is usually just the voltage regulator needs to be replaced.

Why does the battery light come on on my Mercedes Benz?

The message log still indicated a red battery but there was no battery indication on my display. Turn the car off and back on clears the message log. Any thoughts as to what might be going on? Ok, so I had the rear battery replaced and drove about 8 miles to work and no battery light. Drove another 2 miles on my way home and the light comes on.

What kind of battery does a Mercedes Benz have?

The starter battery is good (bought 2 years ago), the rear batter is at 50%, and he alternator is charging at 14.3V. Incidentally, the battery light was not on when these checks were done.

First check the battery voltage to confirm if it’s the alternator. If it is usually just the voltage regulator needs to be replaced.

If necessary, adjust the belt with the help of your car owner’s manual or repair manual. Inspect the belt for signs of cracks, cuts, shiny spots, deterioration or other signs of wear or damage. Change the belt and belt tensioner at the manufacturer’s recommended interval. 2. Check for Wiring Problems

What happens if you start your car without an alternator?

If you were to try and start your vehicle without an alternator, the battery alone would not be able to produce enough power to get the engine running. Even if you had a new car battery and were lucky enough to turn the engine over, it would probably run for about 10 minutes before the power cuts out.

Why does an alternator need to be charged?

Even if you had a new car battery and were lucky enough to turn the engine over, it would probably run for about 10 minutes before the power cuts out. The alternator is necessary to keep the battery recharged and to alternate the electrical current throughout the many components of your vehicle to keep them powered.

When to replace battery, alternator, or starter?

When you check these three, always start with the battery. It’s most often the part that failed, and it’s also the cheapest part to replace. A car battery should last about four to five years. It is not made to hold a charge for that long, so it gets recharged by the car’s alternator while you drive.

Why does my car not start when the alternator is bad?

If your car won’t start, it’s often due to a malfunction of either the battery or the alternator. If it’s one of those two, placing the blame can be relatively simple. Starting and running an engine, in its simplest form, is a three-step process. First, the battery delivers a jolt of electricity to the starter.

How does an alternator start and run an engine?

Starting and running an engine, in its simplest form, is a three-step process. First, the battery delivers a jolt of electricity to the starter. This starts the engine running, which puts the alternator into action. Finally, the alternator completes this cycle by charging the battery.

Can a car alternator fail if the battery is dead?

Alternators can and will fail if they continue to run at full charge. If it is trying to charge a battery that is defective and won’t take a charge it will fail. You’re talking about trying to charge a defective battery, not a dead battery – there is a difference. Get your terminology streight before you accuse others of having their facts wrong.

How long does it take for an alternator to fully charge?

Only if it is about ready to fail anyway. It does put a very high load on the alternator and will make it quite hot. It can take several days for the battery to fully charge under normal driving. The extra load can take out an old belt due to slippage.

Can a bad alternator Fry a new battery?

The flip side is that a defective alternator can fry a battery, also. So replacing a battery and having the new one go bad soon afterward might mean the alternator was bad to begin with. A depressingly large number of people don’t test the charging system after replacing a battery.

When an alternator goes bad does it ruin the battery?

If an alternator goes bad, it certainly can kill a battery. Car batteries don’t like being run all the way down. If you have a fairly new battery, you can usually get away with it once, maybe twice. If the alternator was ailing for a while, the battery may have been low for a long time, which also isn’t good for a battery.

Can a dead battery damage an alternator?

You can damage an alternator by charging a dead battery with it. You have to remember, alternators are intended to maintain a charge on a good battery. If this weren’t true, the people who make battery chargers would be out of business.

I chanced it when I needed a new alternator, I got a new alternator from Advance Auto, their Carquest 130 amp one, and it is working fine so far, but has a lifetime warranty. One thing when testing alternators is many times they will test fine for the short test when cold on the test bench, but when hot they won’t charge worth a darn.

Is the alternator on my Ka car working?

We tested the battery with the car off (12 volts) and tested it with the car on (dropped to 11.8 volts.) Then, with all the lights on, it dropped to 11.0 volts. I know it seems like the alternator isn’t working, but i’m sure that alternator was working on my KA.

Is the Gell cell battery or alternator working?

Brand new gell cell battery, and brand new ka24de alternator of which tested 95 amps. Alternator is NOT working. check your belt too man. make sure it hasn’t loosened up or anything. PoorManQ45 wrote: Alternator is NOT working.

Why did my check engine light come on after I replaced my battery?

An illuminated Check Engine Light can be caused by several different components. First, make sure the replacement battery is the right type for your vehicle. Then check that the vehicle is properly connected to the battery. You should also make sure that the battery terminals are clean, though with the battery being new, this shouldn’t be an issue.

How long does it take for a battery light to go off?

The exact amount of time that your car will be able to function with the battery light on depends on many factors, but assuming that the alternator is the issue (this is the most common issue) it is likely that your car will lose battery power after 30 minutes to an hour of driving.

Get the alternator or wiring fixed, and properly recharge the battery at the same time. The folks at AutoZone can always help with battery and charging system issues, both on the car, and with the parts off the car.

The exact amount of time that your car will be able to function with the battery light on depends on many factors, but assuming that the alternator is the issue (this is the most common issue) it is likely that your car will lose battery power after 30 minutes to an hour of driving.

Who is Hey engine man what is draining my battery?

Hey Engine Man – What Is Draining My battery? Hey Engine Man: What Is Draining My Battery? Successful Farming Engine Man Ray Bohacz has engine grease and field dirt under his fingernails from a life spent repairing vehicles and running a farm.

When does the battery warning light come on?

If you see a warning light come on, you know that your car likely needs some kind of immediate attention, even if nothing appears to be malfunctioning fully yet. This light comes on when your alternator is not making electricity and the car is running off of battery power alone.

What to do if your brake light is not working?

if battery and brake light are on and your not charging the issue is your charging system. check to make the the fat wire that bolts to the alternator (not ground, its fat should be black/red) also bolts into the fuse link/relay box under the hood. check that its grounded.

What does a brake light on the dash mean?

Either you’re low on brake fluid or you might have a brake tailight that’s out. If those are fine tell us so we can narrow this down. Brake light on dash = low fluid or failed ABS (if you have it). Battery light problem might be a failed sensors. PoorManQ45 wrote: Brake light on dash = low fluid or failed ABS (if you have it).

A relatively common “side-effect” of replacing a battery and/or alternator in a car is to have the voltage (battery) warning light come on. This is especially true in late-model vehicles with their more sophisticated internal diagnostic systems. There are usually two things…

The typical lifespan of a new alternator should be between 5 and 8 years. If it has been that long and you have electrical issues, then your alternator may simply be worn out and needs to be replaced. If you think it could be your battery that is at fault, the typical lifespan of a battery is between 2 and 5 years.

Is the brake and Battery Light a problem?

The car ran fine for a while (the brake and battery light went off) so i thought it was fine. Low and behold, it died again in the middle of nowhere Now i’m screwed because i don’t know what it can be. We tested the battery with the car off (12 volts) and tested it with the car on (dropped to 11.8 volts.)

What causes a car battery to die again?

When the voltage regulator is not working properly, this may cause the alternator to allow the power the alternator supplies to drop resulting in the battery dying again. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

When does an alternator stop charging the car?

When voltage drops below 13.5 volts, the regulator will apply current to the field and the alternator will start charging. When the voltage exceeds 14.5 volts, the regulator will stop supplying voltage to the field and the alternator will stop charging. This is how voltage output from the alternator is regulated.

When the voltage regulator is not working properly, this may cause the alternator to allow the power the alternator supplies to drop resulting in the battery dying again. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

When voltage drops below 13.5 volts, the regulator will apply current to the field and the alternator will start charging. When the voltage exceeds 14.5 volts, the regulator will stop supplying voltage to the field and the alternator will stop charging. This is how voltage output from the alternator is regulated.

Why is the battery light on in my car?

The cause of the battery light could be a loose or corroded battery cable or other wire connecting components of the charging system, or it might be a problem with the alternator or voltage regulator. The alternator generates the power that is stored in the battery.

Broken wire coming off the alternator. It may not look broken but it could be broke inside the insulation. That was the story with my 4.6L. The battery light would come on and off, wiggled the single grey wire and it would turn the light on and off.

The easiest way to look at the alternator is to check voltage at the battery. See what DC volts is and check for A/C voltage at the battery (meaning alternator isn’t converting voltage properly). Also check the amperage as well. My guess is you have a blown fuse.

Can a generator be replaced with an alternator?

It appears your system has an alternator which means it is a PCM controller voltage regulator. Generators are the ones with internal voltage regulators and are replaced with the generator. Take a look at the attachments but Navigators with this issue usually have a failed regulator in the PCM. Let me know if you have questions.

I just had the alternator replaced, but my car cuts off while driving. If your vehicle is losing battery voltage (i.e. your battery light is on) the problem may be your battery. You have a new alternator, so if your battery is bad, it won’t hold the charge from the alternator.

BAD ALTERNATOR SYMPTOMS: 1 Dim lights. The failing alternator symptom most drivers recognize is dim or flickering lights. 2 Service engine light. Another obvious sign is the one your vehicle tries to tell you. 3 Odd noises. 4 Electrical issues. 5 Engine stalling. 6 Dead battery. …

Can a bad alternator kill a new battery?

The same situation could happen again with a new battery, if you miss signs of a failing alternator. Many people, even professionals, are quick to assume the battery is bad, but this can be a costly assumption if your failing alternator kills your newly replaced battery, too.

The same situation could happen again with a new battery, if you miss signs of a failing alternator. Many people, even professionals, are quick to assume the battery is bad, but this can be a costly assumption if your failing alternator kills your newly replaced battery, too.

What happens when the alternator in your car dies?

The alternator is part of the electrical system of your vehicle. Its key role is to provide power to operate the starter, ignition and all of the electronic accessories in your car. If the alternator starts to die, you might notice your headlights and/or dashboard lights beginning to dim.

How can I tell if my alternator is on the Fritz?

Most modern cars have a dashboard warning light that alerts you when the alternator is on the fritz. Usually, the light will be shaped like a battery, though, some might say ALT (for alternator) or GEN (for generator). This light may only trigger if you are using multiple electrical components.

What to do if your alternator is weak?

If the battery is really weak or dead, the alternator cannot bring it back to life. To troubleshoot whether the issue is the alternator or the battery, just charge the battery and restart the vehicle. If the battery is weak or dead, the car will continue to run but the lights will again become dim after a short time,…

How can I tell if my car battery is draining?

If this switch malfunctions or is misaligned it will allow the light to stay on draining the battery. This can be sometimes tough to see in the bright light of day and its best to check during the evening time, look for light inside the unit through the small cracks in and around the box door.

What should I do if my Nissan alternator is bad?

This time they said they wont replace the battery as alternator might be bad and would do an electric test to confirm. They did alternator test and confirmed that nothing is wrong with alternator and I should take the car to a nissan dealership; they told me Nissans are known for their electrical problems.

How many volts does a Nissan Sentra alternator produce?

A new, cost-friendly alternator for Nissan Sentra from AutoZone ensures that your car continues to be reliable and adept in any driving condition by producing up to 14.8 volts of electricity, which not only keeps your battery charged but also powers your radio, locks and headlights.

If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system. If the alternator fails, replace it with a new or rebuilt unit and re-test system, if the alternator tests ok proceed to the next step.

Is it possible to kill an alternator with a dead battery?

Urban myth… but it is so pervasive that it may well prevail into the 22nd century. Even most automotive “experts” insist it is so. It is not difficult to design an automotive charging system that will protect the alternator/generator from high loads.

As a battery ages it loses its ability to hold a charge, as a rule of thumb a battery will last about three to four years. If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system.

Can a bad alternator cause a car to lose power?

Although your battery may have enough energy to get the engine fired up initially, it will eventually lose power if it is not being recharged by the alternator. Here are a few quick ways to pinpoint a bad alternator: Crank over the engine, turn on your vehicle’s lights, and observe.

What to do if your alternator is not working?

Alternator is NOT working. check your belt too man. make sure it hasn’t loosened up or anything. PoorManQ45 wrote: Alternator is NOT working. Like he said, the alternator will not work if the wiring to it is bad. It must see the system voltage in order to correctly function. Check the wiring.

How can you tell if your alternator is a problem?

How to tell if the alternator is the problem. If the battery is working, it’s time to take a closer look at the alternator. There are certain signs of a bad alternator to look for: While running the car, take note of the interior lights and how bright these appear.

What does it mean when your alternator stops the car?

If you can’t get it to restart, this is a sign the alternator is doing its job of keeping the battery working while the motor is running, but the battery isn’t retaining the charge when the alternator has stopped. The car battery could be old. As batteries age, they become less able to retain a charge because the metal inside corrodes.

Why does my car battery light keep coming on?

Replaced alternator and battery. When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on.

How can I tell if my alternator is charging the battery?

Use your multimeter (if you don’t have one get one). Turn it to dc volts put your leads on your battery (with the car running), if your alternator is charging it should read from 13.5V-14.5V (thats a good charge). If your not getting a reading from there you can check your output from your alternator.

Why does my battery light not come on when I start the car?

Excessive corrosion at the battery terminals can cause a low voltage condition which makes the starter turn slowly when trying to turn on your vehicle, but it will not illuminate the battery light if the alternator is charging properly once the car is started. Step 4: Secure the clamps on to the battery terminals.

When to know if your alternator or battery is bad?

If you check hours or days after the fact, then you won’t be able to smell anything anymore. Before you go out and order a new battery or alternator, test some of these different systems. If your alternator, coil, battery, or starter is bad, the car probably won’t start, and it definitely won’t be drivable.

Can a Saab 92 start with a bad alternator?

Dual ignition coils (the blue cylinders at the top of the picture) on a Saab 92. Before you go out and order a new battery or alternator, test some of these different systems. If your alternator, coil, battery, or starter is bad, the car probably won’t start, and it definitely won’t be drivable.

What happens when voltage is about the same in an alternator?

If voltage is about the same, new alternator. Remember how alternators regulate voltage, they do so by altering the voltage on the field coils using a regulator that must be referenced to ground. If the ground reference is bad, then the voltage sent to the field coil will not be the voltage the regulator thinks it should be.

Use your multimeter (if you don’t have one get one). Turn it to dc volts put your leads on your battery (with the car running), if your alternator is charging it should read from 13.5V-14.5V (thats a good charge). If your not getting a reading from there you can check your output from your alternator.

What are the warning lights on a Saturn?

The following are warning lights and indicators found in vehicles built by Saturn. Click a link to learn more about each one. They are roughly ordered by importance, which tends to be by color (red, amber, yellow, orange, green, blue, gray). There are over 30 of them, so search carefully!

Why is my intermitent blinking Battery Light not working?

Replaced the Alternator, Battery was fine and strong, but still the problem persisted. I played with the wires (seperating the Alternator/Charging system wires from the rest of the wires) and then pulled them away from the engine block/TBI…..and that corrected my problem.

In theory a car can run only with the alternator charge, but this can cause heavy voltage spikes and other strange symptoms so this means that a bad car battery can cause an alternator to not charge also. Cars are increasingly coming with modern electronics.

What to do when your brake warning light comes on?

When the power in the battery is depleted, the car will shut off and not restart. Most local parts stores will check this for free if you drive the car there. Call ahead to be certain. Another option is YourMechanic. You can get a quote for an alternator and have a qualified mechanic come to you and diagnose your brake warning light.

What happens when an alternator stops the motor?

If you can’t get it to restart, this is a sign the alternator is doing its job of keeping the battery working while the motor is running, but the battery isn’t retaining the charge when the alternator has stopped. As batteries age, they become less able to retain a charge because the metal inside corrodes.

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