Check the pulley alignment on the alternator (as you view it from the side) and also the other other pulleys that use the same belt. The pulleys should all line up otherwise the problem you're having will occur. Even a small misalignment can create problems.
Also, replace the belt tensioner and check bearing condition in the other pulleys.
I am having the same problem with a 99 Protege. I have changed the alternator and aligned/cleaned the pulleys and the problem persists.I replaced the alternator, on my 1997 Mazda Protege, seven times before someone figured out why the serpentine belt kept breaking. It was the belt tensioner! It had to be removed and rebuilt. Now it is working like a charm!! And I havn't had to replace the alternator in over 3 months!!!!
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