Trailer Lights Wiring Diagram 4 Pin. The ground wire should be run from the frame of the. 4 pin trailer wiring diagram this type of connector is normally found on utvs atvs and trailers that do not have their own braking system.
The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector. Blue electric brakes or hydraulic reverse disable see blue wire notes below in the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. Three wires are for the trailer while the last wire is the ground wire.
Many trailers have three circuits.
Note that this type of 4 pin connector is less common that 4 pin flat connector. As a rule you can find these connectors on the older trailers and older vehicles built in the u s. By law trailer lighting must be connected into the tow vehicle s wiring system to provide trailer running lights turn signals and brake lights. I have two amber and two red side marker lights for a boat trailer.
