It’s easy. , mount your lights on the back. Run a hot wire back from your junction box on the trailer to one of the lights.Run a jumper across to the other light(hot side of light) . Hook up both ground wires for each light.NOW back at the trailers junction box located somewhere in front of the trailer,open it up and you should see a YELLOW wire taped off or with a wire connector on it and hooked to nothing. Hook up your hot wire you ran to this yellow wire. Your finished,once you plug your 7 pin connector into your tow vehicle you should have back up lights.The yellow wire is the back up from your imbliical cord.