What makes an alternator whine?
What makes an alternator whine? The grinding sound may be caused by a worn-out bearing. Your car can also make a whining sound when the voltage regulator is sending signals to the alternator to charge more than is necessary. If you hear any type of whining or grinding sound that's a good indication that your alternator needs to be checked. How to eliminate your alternator whine in a car audio system? One word of warning is that some HU's and/or processors nowadays have a zero bit mute, which essentially cuts off the output during low signal passages to reduce noise.....so...