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.
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.
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 should battery voltage be with no alternator?
For advice, check with multimeter set to 12 or 24vdc and test to B+ stud on back of alt to battery then classic ground. With no electricity loads you should get 14.5 v. If it’s at battery voltage, alternator failed. If different then broken cable.
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.
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 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.