4 Wire Trailer Wiring Diagram How To Fix Up

If your vehicle is not equipped with a working trailer wiring harness there are a number of different solutions to provide the perfect fit for your specific vehicle.

4 wire trailer wiring diagram how to fix up. Check the trailer wiring by running a continuity test by connecting a jumper wire to the connector pins and a continuity tester to the sockets. 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. Let s see what types of connectors the trailer light wiring industry uses today. Buy a 4 pin wiring kit with wires at least twenty feet in length so it s long enough for your trailer.

Close up of connector pins. Installing the 4 pin trailer wires. The trailer wiring diagram shows this wire going to all the lights and brakes. If your vehicle is not equipped with a working trailer wiring harness there are a number of different solutions to provide the perfect fit for your specific vehicle.

Our guidelines will help you narrow down and repair the most common causes of issues during 4 and 5 way wiring installations. The red and blue wire can be used for brake control or auxiliary. Complete with a color coded trailer wiring diagram for each plug type this guide walks through various trailer wiring installation solution including custom wiring splice in wiring and replacement wiring. Can also be used as custom wiring on trailers with 3 light wire systems.

Use on a small motorcycle trailer snowmobile trailer or utility trailer. Some trailer builders just connect this wire to the frame then connect the ground from all the other lights and accessories to the frame as well. Use the outlined testing methods to determine whether the issue is on the trailer or the vehicle side so you can more easily pinpoint trouble areas. It can be frustrating when your wiring isn t working especially when you are not sure where to begin troubleshooting.

3 4 inch by 1 inch 6 way rectangle connectors right turn signal green left turn signal yellow taillight brown ground white. Start by cutting the white wire and attaching it to the trailer frame. Yellow and green are for left and right turns and braking. Depending on the size of your trailer and the number of lights you might want to check on the internet for the recommended gauge for your specific trailer.

The most common wire thickness for a trailer is 16 gauge but i bought thicker wiring for added durability.