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Always connect the positive + cable first to the battery. Then connect the negative- cable to the engine somewhere. Never connect the negative cable to the battery itself. Batteries vent hydrogen gas and which can ignite with the slightest spark. For this reason never, ever, connect the negative first and never connect the negative to the battery.

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13y ago
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Anthony Aguon

Lvl 2
1y ago

Connect positive post first and then the negative post.

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Q: When you charge a battery do you connect positive or negative first?
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