Kuryakyn 7675 5 to 4 Wire Converter 5-to-4 wire converter: Plugs in and allows the wiring and relay kits to power trailers requiring a 4-wire harness (run, left turn / brake, right turn / brake, ground). The bonus wire is still available to provide fused 12-volt power to the trailer for compartment lights or keyless entry systems that are wired independently of the trailers essential lighting (includes 4-pin flat vehicle connector). New and improved - Safely and effectively apply the load from your trailer lighting to the battery and not to the rest of the bike's electrical system. Eliminate blown fuses caused by overloading stock lighting or accessory circuits! The relay harness utilizes inputs from the motorcycle to direct power from the battery to the appropriate trailer lighting circuit. Kuryakyn part number: 7675.