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ADVANTAGE Quality wiring material - UL approved. Inline blade fuse & 40A relay - multiple safety protection. Universal Fit - compatible with all automobiles,Boats and devices equipped with a 10-30v power source. Apply to: Off-road driving lights,fog lights,work lights,etc. 40A 12V 2 Lead LED Wiring Harness Kit Designed and made specifically for high output light bars which has substantially higher amperage draw than its smaller counterparts. It is a perfect accessory for off road vehicles, working vehicles and any automobile that could use a relay to power specific equipment. It is universal fit for any 2 x 2" to 54" light bars.Can be used to power up the largest 312 Watt LED off road light bars.And more than 12 ft of wiring,this wiring harness for LED off road lights simplifies the installation process of powering various equipment on all automobiles. EASY INSTALLATION 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. Turn on on/off button of switch to test the lights bar. CAUTIONS We recommend professional installation,pls let professinal installer to wire the harness kit; If let the wire short circuit,the harness would melt and even caught a fire,We suggest that wrap all exposed wire with electrical tape to avoid a short circuit; Pls make sure your light within power 312W, or it would got melt as well. Package Included 1 x Wiring Harness,1 x Fuse,1 x Relay,1 x Switch