This is an overview of the 2-wire version. The wiring harness was butt wrapped, the switch wire/pigtail has a connector, I had to cut it to pull it through the firewall. I installed this two wire harness on a 2016 Silverado HD, I installed the relay in front of the fuse box and routed the light wires behind the headlights and then through the bottom choke. I installed my lights on each side of the front license plate (see photo) and I had enough length to connect both lights, I had to wrap about 1.5 feet of extra wire at the tallest beam. From the relay I routed the wire back through the hood latch sockets and then with a long thin straight screwdriver pierced the main fire protection socket to get the wire through the penetration, I had to cut the connector and tape the wiring harness. to a 6" 1/4" long drill bit and pushed it through the hole in the bushing. After unplugging it, I reattached the connector and connected it to the switch wire. I had enough length to run it alongside the existing extra switches with the rest of the cable to the center console. The wire gauge is a good size and the power cord is fusible. I connected the cold side of the trailer running lights 20 amp fuse to a fuse tap I picked up at AZ. I would recommend this product.
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