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There are three wires coming out of the Zex management unit. Two come into the interior (black and red), and the white one stays in the engine compartment. The black wire goes to a good ground, and the red goes to the supplied arming switch, which we mounted to the headlight switch assembly. We then tapped the other side of the switch into a circuit in the fuse panel that was hot with the ignition on and was rated at 20 amps or more.