I have a 3.5 honda that makes a whining type of noise. It's louder when the AC compressor engages.
From research, it seems like a bad diode in the alternator. Is it common? I do not get any dash lights...is this something that needs to be taken care of ASAP?
Is there any way to test it in the car vs on the bench? I've saw a guy on youtube unplug the back of the alternator while running and it would go away. I don't have enough room to try that.
TIA!