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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.
The folks telling you the positive side are correct.If you do the negative side first you can cause a short while you tighten the terminal screw on the positive cable.Same with a car..always positive first.When you disconnect a battery always remove the negative cable first. Source(s): riding for 38 years.