Bad tensioner pulley?, Alternator noise Options

[senick]

So I'm getting a noise from the alternator (pretty sure), and I haven't been able to solve it. My first thought was a loose belt, but checking the tension just by pressing down on it I think the tension is fine. It deflects maybe 1/2 inch if I really press hard. The alternator itself seems fine. I ran the engine with the battery disconnected, turned on the A/C at high, turned on the headlights and radio and gave it a good amount of throttle with no problems at all.
The noise is a squealing noise. It's not present when I first turn on the car, but starts up after the engine has warmed a bit. It gets louder with higher RPMs, and goes away for a second when shifting up. The car drives fine, but I'd really like to get this solved. The belts are only about a year old, and look fine.

[rave2n]

Sounds to tight, few ways to find it. Atleast in my exp, can't say its the best way..but its worked for me.

Pipe to the ear, til its the loudest to confirm. Spray a lub on each til it stops, will tell you which one.

Mine squeeled for 2 years on and off, ended up just changing all the belts, confirming tension, and replacing a tensioner pully after I got the belts right being that wanted to make noise next. End result, I can change my belts in 10 mins, and no more noise =P