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my son has a 91 sunbird 4 cylinder the alternator went bad have replaced it 3 times and the news ones instanty die.they all came from autozone lifetime warrenty.we also bought brand new battery.
 

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Im not an expert at all, but may i suggest checking the voltage regulator? Also, if your son has a large amp and subwoofers in the car without a capacitor or to weak of one, that is also pretty hard on alternators. beyond this i dont know. I hope this helps.
 
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