Required to install any plug-&-play Kuryakyn rear lighting accessoryAfter this one-time installation you can simply plug-&-play all future Kuryakyn rear lighting accessories with ease and no need to modify any wiringProvides Run, Turn, Brake and Ground wiring connection behind license plate center panel on '12-later GL1800 Models or connects new 6-pin style Kuryakyn rear lighting accessories on Pre-'12 GL1800 Models