Kuryakyn 7671 Universal Trailer Wiring/Relay Harness New and improved Safely and effectively apply the load from your trailer lighting to the battery and not to the rest of the bikes electrical system Eliminate blown fuses caused by overloading stock lighting or accessory circuits The Relay Harness utilizes input from the motorcycle to direct power from the battery to the appropriate trailer lighting circuit 5 Wire Plus 1: Our kits provide standard 5 wire output (run, brake, left turn, right turn, ground) plus a bonus wire that can be connected as needed to provide fused 12v power to the trailer for compartment lights or keyless entry systems that are wired independently of the trailers essential lighting