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Can be because of a bad battery, or overloading the charging system with extra accessories (like aftermarket stereos), or jump starting either that car or other cars with that car. If none of the above there may be a short or other electrical problem. Sometimes vehicles just have bad designed alternators that don't live long, or the rebuilders don't replace enough of the components to successfully give you a good part. Try a new not rebuilt part if you can and see if that doesn't work better.

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Q: Why does your car keep blowing alternators?
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