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2026. 6. 30. 작업

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Lots of sparks and heat when jump starting a car

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With the description you give, I'd say you connected them backwards with about a 99%+ assurance. Large amounts of sparks followed by heat are both VERY BAD SIGNS (as you soon figured out) and almost always mean you have the jumpers on backwards. Never trust what the covers on the battery says. Check what the battery says to be sure. If there is no way to see what is on the battery (the terminals cover them), follow the cables back to their source. The negative will go to a ground and the positive will go to the starter and to the alternator. If those are correct, ensure that the jumper cables are correctly aligned. Some sets I've seen will have black shielding on both with a thin yellow (or some other color) stripe up them. It would be very easy to mix these up. If you still think it was right, you could ultimately check each side of the jumper cables for continuity to ensure you are matching them up.