Required to install any plug-&-play Kuryakyn rear lighting accessory. After this one-time installation you can simply plug-&-play all future Kuryakyn rear lighting accessories with ease and no need to modify any wiring. Provides 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.