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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.
Start at one end of the batteries... Start at one end, and connect the positive post of the first battery with the negative post of the second. Connect the positive post of the second with the negative post of the third. Repeat the process until you get to the end.