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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.
Locating the Battery Cables. 1  1. Put on safety glasses and gloves. 2  2. Ensure the car is turned off. 3  3. Locate the battery.  4. Determine which is the positive and which is the negative terminal.