What should I do Before I replace my alternator?

Before you replace the alternator make sure that your battery is not the problem. One thing you can do to troubleshoot your car is to go to Advance Auto Parts or AutoZone and have them do a FREE alternator / battery check. This test may be able to point you in the right direction. 3. Secondary Battery / Auxiliary Battery.

Where does the battery connect to the alternator?

He states that the alternator should connect to the electrical of the car. Positive battery terminal to the solenoid, solenoid (connected to the same bolt) to the alternator (Magnetti Marelli) main bolt. Negative battery terminal to chassis ground. If it matters, my battery is located in the rear trunk so everything is relatively close together.

Why do I get battery alternator VISIT WORKSHOP error message?

These are the main reasons why you are getting the Battery Alternator Visit Workshop Error Message. If you need to replace any of the batteries you can order them on Amazon using the links below and also help us at the same time. Malfunction electrical consumers switched off.

Is the alternator the only thing that powers the car?

Many people assume that the car’s battery is the only thing that powers all electrical components in the car. But, this is not true. The alternator plays a vital role in supplying power to the car’s AC, recharging the battery and ignition.

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.

What can I use to test battery and alternator?

Most professionals use a carbon pile load tester or a digital battery/charging system analyzer to test the battery and the alternator. The problem is, most DIYers don’t have these tools⁠—but they do have a digital multimeter (DMM). You can use a DMM to check both battery state of charge and alternator output at home.

What should the engine speed be with a bad alternator?

Connect the black meter lead to the negative battery terminal and the red meter lead to the positive battery terminal. Increase engine speed to around 1,500-2000 RPM. If the alternator is charging, generally, the reading on your meter should be around 13.5 to 15.0 volts with all of the lights and accessories turned off.

What’s the difference between an alternator and a battery?

When the engine is running, the alternator charges the battery, while also powering your car’s electrical system. The alternator is an engine-driven device that converts mechanical energy into electrical energy. The battery, on the other hand, supplies electrical energy to your car when the engine is off.

What should the voltage be in a car alternator?

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. If you have a multimeter like this one, you can connect it to the battery terminals to get a voltage reading.

What does it mean when battery and alternator are switched off?

In this case you may get error message saying: malfunction electrical consumers switched off. Check your batteries and alternator. • The battery control module (BCM) also activates the battery isolating relay (K57/2) if necessary. A distinction is made between 2 states:

Is the alternator still running off the battery?

Now i hooked up the voltage tester to the battery with the new alternator and the car still seems to be running off just the battery (at about 12 volts).

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.

What should voltage be when alternator is running?

When the car is running the alternator produces electricity and the voltage should be above 13.5 volt. If you have a multimeter like this one, you can connect it to the battery terminals to get a voltage reading. Main battery is near the end of it’s life. Secondary (Aux) Battery needs replacing (if applicable).

Where can I buy a new alternator for my Mercedes Benz?

You can get a brand new MB altenator at the dealer for about $800 and have them put it in for another $200, of course the advantage is they will wash your car and give you a loaner. Or you can buy an remanufactured alternator from your favorite parts supply store for about $180, replace it yourself in about an hour (and that’s taking your time).

Now i hooked up the voltage tester to the battery with the new alternator and the car still seems to be running off just the battery (at about 12 volts).

How do you remove an alternator on a Mercedes Benz?

Unplug the connector that goes into the back of the alternator. Pres on the tab and pull it away from the alternator. Remove the two bolts that hold the alternator in place using the Female E Torx sockets we listed on the required tools section above. Remove the alternator. It won’t be easy to remove it but you can do it.

How to replace alternator on Mercedes Benz E C CLK SLK s?

Tighten the nut for the electrical cable ( positive +) between 15-18Nm. Plug the electrical cable on the back of alternator and make sure it clicks when you push it in. That way you know it is locked in place. Reinstall the serpentine belt, the engine cover and the reconnect the battery. 2 Bolts that hold the alternator in place. Max 45 Nm.

What to do if your alternator is over charging the battery?

Ask an assistant to start the engine and hold engine speed at about 1500 RPM. Measure voltage across the battery with your DMM. You should get 0.5 to 2 volts higher than base voltage. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty.

How to know if your alternator is working properly?

1 Check the drive belt or serpentine belt. Look for signs of wear or damage like cuts, shiny spots or missing chunks under the belt. 2 Also, check the belt tensioner for proper operation and damage. It should rotate freely. 3 Make sure the alternator is properly mounted. 4 Check the alternator for noises.

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.

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