This trailer wire harness isolates the load between the motorcycle and the trailer through four 10 amp relays to prevent electrical feedback. The heavy duty circuit board can handle a continuous 16 amp steady load and further isolation is provided with a separate 15 amp inline fuse for additional protection. Plugs into existing wire harness, no splicing required. Works with 5 pin trailer connector(not included). For Honda GL1800 2001-2010.