Trailer Light Connector. A number of standards prevail in North America, or parts of it, for trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers. Normally these tend to be exposed to a fair amount of road.
Four wire trailer light connectors the typical type of connection used for pulling small to medium boat trailers and small utility trailers. Amazon's Choice for trailer light connectors. Some trailer builders just connect this wire to the frame, then connect the ground from all the other lights and accessories to the frame as.
Looks like the plug in is there for an adapter but the adapter is missing.
This installation is designed to for most trailer connector four wiring.
Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. LED lights had been installed on this trailer about a year ago. Obey the law and stay visible on the road while towing your boat trailer with boat trailer lights from Great Lakes Skipper.