What causes our new belts to break after about 2 weeks? on 1992 Mercury Capri

When the alternator went bad, the belt had to be replaced. About a week after the belt has been replaced, the car belt squeels when starting and the battery guage drops to low then goes back up to high. Then after about a week of squeeling, the belts breaks. We have replaced the alternator twice and the belt 4 times. Our mechanic cannot figure out what is wrong. 92,000 miles. First time belt has been replaced was with the alternator replacement.

by in Moneta, VA on August 25, 2010
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3 answers
ANSWER by , November 03, 2010
The replacement alternator has the wrong pulley on it there was a recall for this issue and they make a pulley replacement kit had the exact problem on my 91' replaced the pulley and problem was solved
ANSWER by , August 25, 2010
Sounds like you have a pully out of alignment. Puts belt at a angle. Or poss. (but not often) tensioner keeping belt to tight.
ANSWER by , January 18, 2011
The belt is not tight enough had the same problem with my 93 fought it for days. the belt has to be really tight snug will not do.