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The pulleys may be out of alignment due to a bent or misinstalled alternator bracket. the alternator itself may be pulling so much current that the belt is slipping on its pulley. (might be why the other alternator failed. Check the battery voltage with everything turned off and see if you have a parasitic battery drain.) The bearing for the idler pulley (if equipped) could be failing.
it could be the tensioner, water pump, alternator, A/C compressor, power steering, or even a really bad serpentine belt. The only way to be sure is to remove the s-belt and spin-check the pulleys and listen for squeaks or grinding bearings.
the belt is either loose, or one of the many bearings that it spins is squealing. get a stethescope and hold it to each one of the accessories whilst running, a very long screwdriver held simultaneously to the ear also works, if none of them screech loudly then you should be looking at a new belt or the tension of same.
It probably is a belt. You should look under the hood and check for a loose belt. Tighten as necessary. You should not be able to deflect the belt more than 1/2" in the center of the span of the belt.
Brakes will also make a screeching noise when they are worn out. This noise will also go away when you stop (of course). The sound is quite different than the belt sound.
it sounds like the power steering belt is loose. If it has a tensioner pulley the spring in it might be loosing it's tensile strength. While you are looking at the belt pay attention to the side that is against the pulley to see if it has alot of cracks. If it has I think 10 cracks per inch that is too much and needs to be replaced.
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