4 pin flat wiring is a common standard for trailers and allows basic lighting functions such as stop, turn, and tail lights to be operated. If you’re looking to install a trailer hitch or add a trailer to your vehicle, understanding the 4 pin flat wiring diagram is essential. In this article, we’ll go over everything you need to know about 4 pin flat wiring, including the wiring diagram, tables, and frequently asked questions.
What is 4 Pin Flat Wiring?
4 pin flat wiring is a wiring harness that connects a trailer to a tow vehicle. It consists of four wires that transmit the electrical current to operate the trailer lights. The four pins in the wiring harness are color-coded to make it easier to identify which wire is which. The wire colors are typically white, brown, yellow, and green.
The white wire is the ground wire, the brown wire is the tail light wire, the yellow wire is the left turn signal wire, and the green wire is the right turn signal wire.
4 pin flat wiring is the most common type of wiring harness used on small trailers, such as utility trailers, boat trailers, and camper trailers. It is easy to install and can be used with most vehicles that have a factory-installed trailer hitch.
4 Pin Flat Wiring Diagram
The 4 pin flat wiring diagram is a simple diagram that shows the connection between the four wires in the wiring harness. The diagram is as follows:
| Wire Color | Function | Diagram |
|---|---|---|
| White | Ground | ————————-> |
| Brown | Tail Lights | ————–|————–> |
| Yellow | Left Turn Signal | —————–|———> |
| Green | Right Turn Signal | —————-|——–> |
The diagram shows how each wire is connected to the trailer lights. The white wire is connected to the trailer frame or ground, while the other wires are connected to the corresponding light on the trailer.
FAQ
1. How do I install a 4 pin flat wiring harness?
Installing a 4 pin flat wiring harness is easy and can be done in a few simple steps. First, locate the factory-installed trailer hitch on your vehicle. Next, plug the wiring harness into the connector on the hitch. Finally, connect the other end of the harness to the trailer.
2. What is the maximum weight a trailer can carry with a 4 pin flat wiring harness?
The maximum weight a trailer can carry with a 4 pin flat wiring harness depends on the towing capacity of your vehicle. Check the owner’s manual to determine the maximum weight your vehicle can tow.
3. What if my trailer has more than four lights?
If your trailer has more than four lights, you may need to use a different type of wiring harness. A 5 pin or 7 pin wiring harness may be necessary for trailers with more than four lights.
4. Can a 4 pin flat wiring harness be used on any vehicle?
A 4 pin flat wiring harness can be used on most vehicles that have a factory-installed trailer hitch. However, some vehicles may require additional wiring or adapters to make the connection.
5. Can I use a 4 pin flat wiring harness on a boat trailer?
Yes, a 4 pin flat wiring harness can be used on a boat trailer. However, it is important to ensure that the wiring harness is properly sealed and protected from water damage.
Conclusion
4 pin flat wiring is a simple and easy-to-install wiring harness that is used on most small trailers. Understanding the 4 pin flat wiring diagram and how to install the harness is essential if you’re looking to add a trailer to your vehicle. By following the wiring diagram and installation steps, you can ensure that your trailer lights operate correctly and safely while on the road.
