4 Wire Trailer Lights Diagram. Custom wiring is the ideal solution for installing trailer light wiring on your vehicle. These too would run off the brown or parking light wiring same as the license plate light.
Start by cutting the white wire and attaching it to the trailer frame. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above. A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights.
And the third diagram using clearance lights.
This is a short video series of the steps that i have taken to refurbish and old utility trailer that was designed and built by my father. I have two amber and two red side marker lights for a boat trailer. This is an older 1999 trailer. They also provide a wire for a ground connection.
