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Damage to the alternatoron both can occur and permanent damage to the batterries also can occur. Always be sure of +positive to +positive and -negative to -negative if unsure do not attempt to jump vehical it can be a costly mistake

It can "fry" the alternator, the computers, wiring, fuses, and the battery.

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Q: What damage could you have done when you put the jumper cables on the battery backwards?
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