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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.
Connect the first jumper cable clamp to the positive terminal (+) on the dead battery. Next, connect a clamp to the positive terminal (+) on the live battery. Connect a clamp to the negative terminal (-) of the good battery, and finally attach the last clamp to a ground on the chassis of the dead car.