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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.
Leave the car off. Start the motorcycle. HINT! If you at this point is actually hooking up your motorcycle battery to another motorcycle battery instead of a car battery, you should actually turn on the motorcycle with the good battery first and then turn on the motorcycle with the bad battery last.