The Trailer Wiring & Relay Harness utilizes inputs from the motorcycle to direct power away from the battery to the appropriate trailer circuit.; Provides standard 4-wire output (run, left and right turn/brake, ground) Includes flat-4 connector Eliminates overloading stock lighting or circuits Plug-and-play installation Contains a "bonus wire" that provides fused 12v power to the trailer for compartment lights or security/keyless entry systems