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If you cross the neg. with the pos. on a battery you could blow up both batteries and also blow the fuses on both cars.

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โˆ™ 2010-01-11 17:31:57
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Q: What happens to a car if when attempting to boost a dead battery you inadvertantly cross the positive and negative on the dead battery?
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What happens when you inadvertently crossed the positive battery terminal from a negative to a positive and a positive to a negative.?Read more: What_happens_when_you_inadvertanly_crossed_the_positive_battery_terminal_from_a_negative_to_a_positive_and_a_positive_to_a_negative.

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