The GL18007-38 is a plug-n-play motorcycle trailer wiring sub-harness for 2012-2017 Honda Gold Wing GL1800 models. Ā Simply unplug your factory taillight from the factory wire harness (usually located under the seat), then plug in the GL18007-38 to the mating factory male and female connectors.Ā You are now ready to plug in other wiring like the TWC004 to complete the connection between your motorcycle and trailer.