If you’re a trailer owner, you know how important it is to have a properly functioning wiring system. Besides ensuring that all your lights, brakes, and turn signals are working, it’s also crucial for your safety on the road. One of the most common trailer plug wiring systems is the 5 7 pin configuration. In this article, we’ll go over everything you need to know about the 5 7 pin trailer plug wiring diagram.
What is a 5 7 Pin Trailer Plug Wiring Diagram?
A 5 7 pin trailer plug wiring diagram is a schematic representation of the electrical connections that run between your trailer’s brake lights, turn signals, and other electrical components and your towing vehicle. This diagram shows how the pins on the 5 7 pin plug should be connected to ensure proper operation of your trailer’s electrical systems.
Before we dive deeper into the specifics of the 5 7 pin trailer plug wiring diagram, let’s have a quick look at the difference between 5-and 7-pin trailer plugs.
5-Pin Trailer Plug Wiring Diagram
A 5-pin trailer plug is the simplest type of trailer plug configuration. It typically consists of five pins that provide power to the trailer’s brake lights, left and right turn signals, electric brakes, and a ground wire. Below is a table outlining the wiring configuration of a 5-pin trailer plug:
| Pin Number | Color | Function |
|---|---|---|
| 1 | Brown | Taillights |
| 2 | Yellow | Left turn signal |
| 3 | Green | Right turn signal |
| 4 | White | Ground wire |
| 5 | Blue | Electric brakes |
As you can see, the 5-pin trailer plug is relatively basic, and it’s not suitable for trailers that have more than two axles or those that require additional power for accessories.
7-Pin Trailer Plug Wiring Diagram
A 7-pin trailer plug is more advanced than a 5-pin version and is the most common wiring configuration found on trailers that require additional power for accessories, such as horse trailers, RVs, and boats. Below is a table outlining the wiring configuration of a 7-pin trailer plug:
| Pin Number | Color | Function |
|---|---|---|
| 1 | Brown | Taillights |
| 2 | Red | Left turn/brake light |
| 3 | Green | Right turn/brake light |
| 4 | Black | Battery charge/auxiliary |
| 5 | Blue | Electric brakes |
| 6 | White | Ground wire |
| 7 | Violet | Reverse light |
As you can see, a 7-pin trailer plug provides additional functions that aren’t available on a 5-pin version, such as battery charge and reverse light.
5 7 Pin Trailer Plug Wiring Diagram: Pinout and Wiring Explained
Now that you have a basic understanding of 5- and 7-pin trailer plugs, let’s take a closer look at the wiring diagram for a 5 7 pin trailer plug.
As its name suggests, this type of trailer plug includes both 5-pin and 7-pin connectors. The 5-pin side of the plug typically has the same configuration as a 5-pin trailer plug, while the 7-pin side provides additional functions that aren’t available on a 5-pin plug.
Below is a table outlining the pinout and wiring for this type of trailer plug:
| Pin Number | Color | Function |
|---|---|---|
| 1 | Brown | Taillights |
| 2 | Red | Left turn/brake light |
| 3 | Green | Right turn/brake light |
| 4 | Black | Battery charge/auxiliary |
| 5 | Blue | Electric brakes |
| 6 | White | Ground wire |
| 7 | Violet | Reverse light |
| 8 | Yellow | Backup/hazard lights (7-pin only) |
| 9 | Light blue | Electric brake control (7-pin only) |
| 10 | Orange | 12V power supply (7-pin only) |
As you can see, a 5 7 pin trailer plug provides additional functions that aren’t available on a 5-pin version, such as backup/hazard lights, electric brake control, and 12V power supply.
FAQs
1. Can a 5-pin trailer plug be used on a trailer that requires a 7-pin plug?
No, a 5-pin trailer plug is not suitable for trailers that require a 7-pin plug. A 7-pin plug provides additional power and functions that are not available on a 5-pin version, and a 5-pin plug can’t handle the electrical load required by larger trailers.
2. How do I wire a 5 7 pin trailer plug?
The wiring configuration for a 5 7 pin trailer plug is straightforward. Simply follow the pinout and wiring diagram we provided in this article and connect the wires accordingly. Make sure to use the correct gauge wire for each function, and use electrical tape or wire connectors to secure the connections.
3. What is the difference between a 5 pin and a 7 pin trailer plug?
A 5-pin trailer plug provides power to the trailer’s brake lights, left and right turn signals, electric brakes, and a ground wire. A 7-pin trailer plug provides additional functions, such as battery charge, reverse light, backup/hazard lights, electric brake control, and 12V power supply.
4. Why is proper trailer plug wiring important?
Proper trailer plug wiring is essential for your safety on the road. A poorly wired trailer can cause accidents, damage to your vehicle or trailer, and even result in fines or legal consequences. By ensuring that all your lights, brakes, and turn signals are working correctly, you’ll have peace of mind knowing you’re traveling safely.
5. How do I troubleshoot trailer plug wiring issues?
If you’re experiencing issues with your trailer’s electrical systems, the first step is to check the wiring connections. Ensure that all the wires are correctly connected and secured with electrical tape or wire connectors. If the wiring is intact and the problem persists, you may need to check the fuses or wiring on your towing vehicle.
Conclusion
A 5 7 pin trailer plug wiring diagram is an essential tool for every trailer owner. By understanding how the pins on the trailer plug should be connected, you’ll be able to ensure that all your trailer’s electrical systems are working correctly. Whether you’re towing a small utility trailer or a large RV or boat, proper trailer plug wiring is crucial for your safety on the road.
