Every Battery Jump Instructions I have read tells you not to put the negative on the negative battery terminal........
"You usually want to avoid placing the Negative(-) cable directly on the dead battery to minimize the chance for explosions. "
"Attach the other end of that cable to the engine block of the car with the dead battery. Look for unpainted metal surfaces and be sure it will clear anything moving when the car starts. Do not attach the negative cable to the dead battery itself"
"Connect the other end of the negative cable to metal on the engine block on the car with the dead battery. Don't connect it to the dead battery, "
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