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♦ Specification:Maximum Wattage: 300W 14AWGOperating Voltage: 12V DC Power♦ Quick & Easy Install1. 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.♦ Package included:1 x wiring harness♦ Note:- The Wiring harness needs to be used under relevant voltages- Please match the wiring hardness with correct operating voltage- Easy to install, but professional installation is highly recommended!- Please allow 1-3cm error due to manual measurement. Thanks for understanding.