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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
1. Connect Positive Cables First Connect one positive or red cable end to the positive or red terminal on the dead battery. Connect the other end to the positive terminal on the good battery. 2. Connect Good Negative Attach the negative or black clamp to the negative terminal on the supply battery.