posted this in off topic, probably not the best place for it - Been noticing since I started driving my car this year (02 TA) that after the engine warms up to operating temp and has been driven at temp for x amount of time, i get a high pitched whine coming from the engine bay at idle, any gear, and volume of the sound increases with RPM. It's not an overwhelming sound but its there and its annoying. It can definitely be heard from outside of the vehicle. When it starts to make this noise my dash volt meter drops to ~13v and under, sometimes as low as 9v. as soon as i start going again volts come back up to 14-14.8v. when the engine is cold/not ran at temp for x amount of time, there is no noise, and volts stay at 14-14.8v at idle/driving. based upon that i took off the main drive belt, and ran it. noise stayed. that eliminated the alternator from the system. i did find a bad pulley on the main drive tensioner, replaced it. but that wasnt the problem the noise did not change through rpm at idle with the main drive off. it almost sounds like the noise is coming from the rear left of the engine. any ideas/ran in to this before? it almost sounds like an electrical whine, which would make sense if my voltmeter is acting funny when this is being problematic.