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You can count on the alternator diodes being fried. But you might be able to have it tested. After that, much of the OTHER stuff has protection. Unfortunately, polarity protection is difficult if not impossible with an alternator.

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Q: How do you find out what systems are damaged after connecting the battery in reverse on a 1989 Ford F-150?
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How do you find out what systems are damaged after connecting the battery in reverse?

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