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BEEYEO Heavy Duty Led Light Bar Wiring Harness 2-lead utilizes copper 12-Gauge wires and weatherproof spade connectors for up to 180W high-power led lights connections. The whole harness is almost wrapped by a very heavy vinyl cover, with a waterproof inline fuse and reliable 40amp relay, well protecting the circuit against voltage spikes, heats and even burnouts.It compatible with all automobiles,Boats and devices equipped with a 10-30v power source. Specification: Maximum Wattage: 180W Operating Voltage: 12V DC Power Quick & Easy Install 1. Connect the red+ wire from the fuse to battery +; connect the black wire from the relay to the battery -; 2. Connect the white+;black- wire from the relay to light bar(red/black correspond to the wire of lights bar) ; 3. Connect the red+/black- wire of the switch to battery or any place of your car system to get power for the switch; 4. Turn on on/off button of switch to test the lights bar. Cautions: - Professional installation of this HD+ series wiring harness is highly recommended! - All the exposed wires needed to be wrapped by electrical tape to avoid a short circuit. - Please make sure that the total power of dual light fixtures is not exceed 180W, or it would get melt. - Please allow 1-3cm error due to manual measurement. Thanks for understanding.