If you’re into towing, you already know that the seven-way trailer connector is the most common type of wiring for trailers. It’s more versatile than the four- or five-way connectors and can accommodate more functions. But it can also be a bit confusing to wire the plug correctly. This article will provide you with a complete guide on how to wire a seven-way round trailer plug.
What is a Seven-Way Round Trailer Plug?
A seven-way round trailer plug is a circular connector that allows for the connection of multiple circuits between the towing vehicle and the trailer. The seven pins on the plug provide connections for the following functions:
- Ground
- Tail/Running Lights
- Left Turn Signal
- Brake Lights
- Right Turn Signal
- Electric Brakes
- Auxiliary (12V+)
The pins are arranged in a circle around the center, with the ground pin at the 6 o’clock position, and the other pins placed clockwise around the circle.
Wiring a Seven-Way Round Trailer Plug
The wiring process for a seven-way round trailer plug can be complicated, but it’s not impossible to do yourself. Follow the steps below to wire your trailer plug:
- Disconnect the trailer from the vehicle and remove the old plug.
- Strip about 1/2 inch of insulation from each of the wires on the trailer side of the plug.
- Insert the wires into the corresponding pins on the new plug, following the diagram below.
- Crimp the wires securely onto the pins.
- Attach the plug to the trailer frame with a cable tie or other fastener.
The Seven-Way Round Trailer Plug Wiring Diagram
To wire a seven-way round trailer plug correctly, you need to follow the right wiring diagram. The diagram below shows the correct wiring for a seven-way round trailer plug:
| Pin Number | Function | Wire Color |
|---|---|---|
| 1 | Ground | White |
| 2 | Tail/Running Lights | Brown |
| 3 | Left Turn Signal | Yellow |
| 4 | Brake Lights | Red |
| 5 | Right Turn Signal | Green |
| 6 | Electric Brakes | Blue |
| 7 | Auxiliary (12V+) | Black |
FAQs
1. What if my trailer has a different wire color code?
While the wire colors in the diagram above are the standard for a seven-way round trailer plug, wire color codes can vary. Always refer to the wiring diagram for your specific plug to ensure that you are wiring it correctly.
2. Can I use a seven-way round trailer plug on a four-way flat trailer?
Yes, you can use a four-way flat to seven-way round adapter to connect a four-way flat trailer to a vehicle with a seven-way round connector. However, keep in mind that you will only have access to the four basic functions and not the additional circuits provided by the seven-way connector.
3. Can I wire my seven-way round trailer plug myself?
Wiring a seven-way round trailer plug is not an easy task, but it’s not impossible either. If you’re comfortable working with electrical wiring, have the necessary tools, and follow the wiring diagram correctly, you can wire your trailer plug yourself. However, if you’re not confident, it’s best to have a professional do it for you.
4. How do I troubleshoot my seven-way round trailer plug?
If you’re having issues with your seven-way round trailer plug, the first step is to check that all the connections are secure and the wires are not damaged or corroded. You can use a multimeter to test the continuity of each circuit. If you’re still having issues, consult a professional or refer to the manufacturer’s troubleshooting guide.
5. Do I need to use a specific type of wire for my trailer plug?
Yes, you should use a wire that is rated for outdoor use and can withstand exposure to the elements. Typically, 16-gauge wire is sufficient for most trailer applications, but you should check the wiring diagram for your specific plug to ensure that you are using the appropriate wire gauge.
Conclusion
Wiring a seven-way round trailer plug may seem daunting at first, but it’s a necessary skill for anyone who tows trailers. By following the wiring diagram and the steps outlined in this article, you can wire your trailer plug correctly and safely. Remember to always double-check your work, and if you’re not confident, seek professional help.
