Originally Posted by The Yin

I've got a sound that I'm sure is somehow related to something in contact with the driver belt. What? I'm not sure. It's a clipping or chirping or chattering sound (sorry, no video yet.)
Today I was able to make the sound Start or Stop by turning On or Off my AC. Other times it seems to start when I turn the wheel, but stop when I'm not turning.
Power steering and AC work fine. I haven't tested to see what voltage I'm getting to the battery when the truck is on, so I don't know if it could be the alternator. The water pump was just replace a year ago.
The sound comes and goes, it's not constantly there when the engine is running, so I don't think it's a idler of any kind.
Everything seems to work fine, AC, PS, engine temp is good, haven't had problems with it starting, so I'm assuming the Alt is charging the battery.

Are there any particular parts the would make an intermittent sound like that when they are failing?