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What cause an alternator to blow?

Updated: 10/26/2022
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14y ago

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The usual cause of a blown alternator is overload. The alternator will also blow if the battery is connected backwards, even for an instant, such as during jumping. Sometimes, overload is caused by attempting to jump start another car while revving the engine of the first car. The alternator is not designed to carry the current of a starter. Depending on the alternator, protection might be built in, but don't count on it. Rev the engine only to help charge the other battery, and then let the engine idle while starting the other.

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Q: What cause an alternator to blow?
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