Kuryakyn 7673 Plug & Play Trailer Wiring/Relay Harness Safely apply the load from the trailer lighting to the battery and not to the rest of the bike's wiring/relays/fuses Plug-and-play kit that plugs inline underneath your seat to the bikes main rear harness Kits finish up by connecting directly to your battery and wiring to your trailer plug Add 5 to 4 Converter for trailers with 4-wire connectors Plugs right inline to the Kuryakyn Trailer Wiring Harness and Relay