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The current passed through them was too high. Possibly they are cheap cables, (many of them on the market today.) - Cables should be at least 10 gauge wire. Mine are 6. The thicker wire, the better quality your cables are. Anything thinner than 12 gauge is dangerous,.

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11y ago
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15y ago

The jumpers were probably connected incorrectly. Should be positive to positive and negative to negative. Leave one negative connection last and connect to a good ground on the engine if possible.

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15y ago

Hooking up the cables in reverse or low quality cables are two reasons that would cause them to melt.

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Q: What causes battery to spark and jumpers to melt?
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