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Random question. Got into discussion bout how to jump start the car. I thought when you connect the black (negative), you connect the black to battery (good battery) and connect the other black to some unpainted metal part of other car. (bad battery) My co-worker claim just connect the other black to bad battery... which I'm pretty sure it works fine, but I was thought not to connect the black to bad battery due to it can damage the good battery.
Maybe I'm doing old way? IDK
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