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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.
Route the wiring from the battery to the light(s) in a safe, secure manner. Connect the negative wire to the black wire of the pigtail (DT-MPT or ATP-MPT). Connect the positive wire to the input terminal of the switch. Then connect the output terminal of the switch to the red wire of the pigtail (DT-MPT or ATP-MPT).