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it can rotate in reverse, but it might not charge.

Poor answer above. In fact, dozens of real-world examples can be found on the net proving that alternators can run either direction with virtually no difference at all in output or function. If rotated the "wrong" direction with respect to the built in fan a minor reduction in cooling could eventually affect performance, but only if the charging situation involved a prolonged operation at the highest amperage output. This would typically only happen if the alternator was being used externally to an automobile, such as running off a lawn mower engine for charging a large battery bank, etc.

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Q: Can a automotive alternator rotate in reverse?
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