Why is my battery light on with a new alternator?
It is possible that the problems that you have been experiencing with the bad alternators have damaged the battery causing it to be weak. 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 an alternator be bad and still charge?
If the alternator is starting to go bad, it cannot charge the battery as efficiently. The battery then doesn’t store enough power for starting the car.
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 should I do if my alternator does not pass the test?
Another approach for reducing comebacks and unnecessary warranty returns is to ask your parts supplier to bench test your customer’s old alternator and bench test the new alternator before installing it. If the old alternator passes the tests, the problem is not the alternator, and you’ve missed something.
Where is the volt meter on an alternator?
To diagnose the problem, put the positive wire of your volt meter on the alternator output terminal and the negative wire of your volt meter on the battery plus terminal. Put some load on the battery, such as lights or something, rev the engine, and see how much voltage is getting dropped between the alternator output and the battery terminal.
Why is the battery light still on after a new alternator?
So, now truck has new alternator and battery BUT battery light is still staying on. I had them check both and they said, new battery and alt showing good. I know all of the connections are tight and I checked the fuses inside the truck and all are good.