Trailer Light Wiring Diagram 4 Pin. Yellow and green are for left and right turns and. You must check the trailer manual to see if the wiring is correct, but normally the white wire is called the ground wire, while the brown wire is used for tail lights.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. The circuits are for left and right brake lights and running lights. LED lights had been installed on this trailer about a year ago.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers.
Wiring your four-pin trailer can be a challenge when you first do it, but it's a simple do-it-yourself task.
Over time, the elements can overtake your trailer and create a buildup of corrosion in different areas. Other Possible Trailer Light Wiring Issues. Cut the four-pin plug off of the trailer harness.