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Or the positive terminal. It is typically the ultimate connection that makes the spark capable of igniting something. Jump starting procedure: Connect the positive terminal of the good car with the positive terminal of the bad car. which terminal you connect the jump lead clamp to first is relatively immaterial. I personally do the bad car first because ...


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You can make either or both negative electrical connections to the frame instead of the battery. When connecting, you must make the last (fourth) connection that way, because either battery can make hydrogen. When disconnecting, remove the first connection at a place away from the battery. Going from the 3rd to 4th connection is what causes the spark (...


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Defeating the object ! Paint isn't a good electrical conductor - not even metallic paint ! The idea is that sometimes, when a battery has been charging, and therefore giving off explosive gases, any spark near is likely to cause a big bang. I did it as a teenager - only once, as it cost me a new battery and very nearly my health. So the sensible thing to ...


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Hydrogen is released when a typical car battery is charging. When you remove one jump lead after starting there could be a spark which ignites that hydrogen. It is unlikely to be when you attach the cables – the battery is not at that point being charged. If you attach one cable to a bare metal point on the frame that is not right next to the battery, there ...


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They gave good advice except not the body ie a painted surface - use a big clean bolt or engine mount.


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