Okay, it sounds like the alternator or battery needs to be replaced. This sound can come from the electrical system/alternator if one of the diodes inside the alternator has gone out or if the battery is having a problem and the alternator is overworking causing the noise. I would use a voltameter and switch it to AC voltage, then rev up the engine while the leads are connected to the battery, the voltage should stay at 0, if you get any voltage the alternator is bad.
Here is a guide to help you:
https://www.2carpros.com/articles/how-to-check-a-car-alternator
and
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Here is how to change the alternator in case you need it or what to see what needs to be done. Check out the images (below). Let us know how it goes.
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Monday, February 19th, 2024 AT 10:47 AM