Let me just say that I think I know what's wrong, I'd just like another opinion. Last night I noticed when sitting in the car, there was a whine that changed pitch with the RPM's of the engine. Today the voltage on my car was dropping so low that the USB fed stereo was dropping out. I think the issue is the alternator. I replaced it with a pre-owned one 5-7 years ago, so I think that one may now be reaching the end of it's life.
My question is, is it the alternator, or something else on the same belt that's causing the speed of the belt to drop so low that the voltage is dropping out? I looked at the belt while running and you can't hear the whine in the engine bay, only in the cabin. It's also not slipping as far as I can tell. There's no squealing, just the whine in the cabin. It sound like the sound you get when you start the car, only it doesn't go away after a couple seconds when the RPM's come down to idle.
Any ideas?
My question is, is it the alternator, or something else on the same belt that's causing the speed of the belt to drop so low that the voltage is dropping out? I looked at the belt while running and you can't hear the whine in the engine bay, only in the cabin. It's also not slipping as far as I can tell. There's no squealing, just the whine in the cabin. It sound like the sound you get when you start the car, only it doesn't go away after a couple seconds when the RPM's come down to idle.
Any ideas?