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Old 02-28-2008, 12:45 AM   #3 (permalink)
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grab the pully and wiggle it, you should be able to feel the bearing play, if it's still charging but loud then you are correct in the bearing, a rebuilt alternator is going to be the cheapest rout to take.
two things to check would be the belt tension, and the age and voltage of the battery, but what is most likely happening is the brushes aren't making solid contact because of bad bearings.
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