Wiring Diagram For Trailer Lights 4 Pin

The original wiring on my boat trailer was damaged and installed incorrectly by the previous owner.

Wiring diagram for trailer lights 4 pin. Click on the image below to enlarge it. Use on a small motorcycle trailer snowmobile trailer or utility trailer. Installing the 4 pin trailer wires. Many trailers have three circuits.

Below is the generic schematic of how the wiring goes. Start by cutting the white wire and attaching it to the trailer frame. 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. Traditional trailer with brakes use a 5 pin connector.

The second diagram shows two brake lights two indicators two side lights and a fog light. 5 pin trailer wiring is very similar to 4 pin wiring but it adds in a blue wire for the reverse or backup lights. Rather than inspecting the old wires that were already corroded and falling apart i bought new 4 way trailer wiring and installed the electric myself. Installing 4 pin trailer wiring.

The circuits are for left and right brake lights and running lights. 4 pin connectors are the standard used for most trailers. 4 pin trailer wiring diagram. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above.

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. Not all trailers have reverse lights so consider your own trailer as you wire in a 5 way plug. The red and blue wire can be used for brake control or auxiliary. By law trailer lighting must be connected into the tow vehicle s wiring system to provide trailer running lights turn signals and brake lights.

4 pin trailer light wiring diagram. 3 4 inch by 1 inch 6 way rectangle connectors right turn signal green left turn signal yellow taillight brown ground white. Some of the lights were out but the light bulbs were fine. Trailer electrical connectors come in a variety of shapes and sizes.

To connect the electric system of your trailer to the vehicle you will be using special connector. Three wires are for the trailer while the last wire is the ground wire. Yellow and green are for left and right turns and braking. Here are two wiring diagrams for the 7 pin n type trailer electrical plug.

The first diagram is a simple set up of two brake lights two indicators and two side lights. Click on the image below to enlarge it.