How To Rewire A Trailer 4 Pin

By | August 21, 2022



Trailer harness wiring can be a daunting task for many DIYers, but with the right information, tools and process, you can confidently rewire a 4 pin trailer harness for your vehicle. Understanding the basics of trailer wiring is essential to ensure a secure connection between your vehicle and your trailer. Whether you are using a traditional 4 flat wiring connector or a 7 way adapter plug, the process is relatively easy as long as you follow the right steps.

The first step to rewiring a trailer harness is to determine the type of connector you have. There are several types of connectors that can be used for trailers including 4 flat, 6 flat, and 7 way. Once you’ve identified the type of connector you have, measure the distances from the battery to the trailer and from the trailer to the tail lights to ensure you get the right length of wires. Then, disconnect any existing connector and splice the appropriate size and gauge wire into the vehicle's frame. Connect the power and ground wires to the battery in the vehicle, and secure them with a soldering iron.

Finally, attach the 4 flat trailer plug to the end of the wires you just connected. Make sure all the colors of the wires match up, and check the back of the connector for any exposed metal. If there is, use electrical tape to cover it up. Once everything looks good, use a rubber plug to securely fasten the plug to the back of the trailer. With these simple steps, you'll be able to successfully rewire a trailer harness and have complete control over your trailer's connection with your vehicle.


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