trailer wire colors 4 pin - IOT Wiring Diagram

Wiring a trailer is often an intimidating task, and if you’re attaching a four-pin harness that includes brake lights, turn signals, and running lights, you will need to know the proper color coding for the wires. This article discusses the wire colors commonly used on trailers, and explains the color codes for the four-pin connector that you will most likely find.

When connecting a trailer wiring harness to your vehicle, you should refer to the manufacturer's instructions or look at the back of the connecter on your vehicle to identify corresponding wire colors. It is important that the wire colors are matched correctly, so that each function functions properly. The wiring harness is typically connected to the vehicle frame using screws or clips, or can be located near the hitch.

The four-pin harness will have four wires: white, yellow, brown, and green. White is the ground, yellow is running lights, brown is turn and brake signal, and green is back up lights. It can be helpful to have a few zip ties handy to fasten the wiring harness to the frame of the vehicle after it is attached. Before attaching the wiring harness, use a multimeter to ensure that each color wire corresponds to the correct voltage.

Having the right color code on your trailer wire will help ensure that all functions work properly. Be sure that you follow the instructions provided with the trailer wiring, or refer to the manufacturer’s website for assistance. In addition, double-check the color coding of the wires you are attaching and ensure that they are not damaged prior to installation.

Guide To Trailer Wire Color