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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.
#3 AkRyan Well-Known Member. Well seeing how you can hook up a 50 inch light bar to a single wiring harness, you can hook up a single row 10 inch + a double row 30 inch without exceeding amps. Light bars don't draw very much amperage, hence you could hook up plenty more to one harness.