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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 the other red clamp to the positive (+) terminal of the good battery. 2  Connect one black clamp to the negative (-) terminal of the good battery. 3  Connect the other black clamp to a piece of grounded metal on the dead car, preferably the bolt where the thick negative cable from the battery connects to the chassis. Connect one black clamp to the negative (-) terminal of the good battery. 2  Connect the other black clamp to a piece of grounded metal on the dead car, preferably the bolt where the thick negative cable from the battery connects to the chassis.