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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.
Quick Answer. To hook up a car battery, put the new battery in the car, and hook up the positive and negative terminals. Make sure to refasten any kind of plate that held in the old battery. Dispose of the old battery at a battery recycling center. Continue Reading.