When it comes to towing, having a properly wired trailer is crucial for the safety of both you and other drivers on the road. One of the most important components of a trailer’s wiring system is the 7 plug connector. In this article, we’ll guide you through everything you need to know about trailer 7 plug wiring diagrams, including common terms, wiring configurations, and frequently asked questions.
Common Terms
Before delving into the specifics of wiring a trailer’s 7 plug connector, it’s important to understand some common terms. These terms will help you understand the wiring process and ensure you’re using the right equipment and tools.
Ground
The ground is an essential component of any electrical system. It refers to a conductive connection that provides a safe path for electricity to flow back to its source. In a trailer’s 7 plug connector, the ground wire is typically white.
Power
Power refers to the electrical energy that’s supplied to a device or component. In a trailer’s 7 plug connector, different wires are used to provide different levels of power to various components, such as the running lights or brake lights.
Brakes
Trailer brakes are used to slow or stop the trailer in conjunction with the tow vehicle’s brakes. A trailer’s 7 plug connector typically includes wires that are used to control the trailer’s brakes, including brake lights and brake controller wiring.
Running lights
Running lights are used to illuminate the trailer when it’s being towed. These lights are required by law and must be functional for safe operation. A trailer’s 7 plug connector typically includes wires that power the running lights.
Turn signals
Turn signals are used to alert other drivers when the trailer is turning or changing lanes. A trailer’s 7 plug connector includes wires that control the trailer’s turn signals and flashers.
Wiring Configurations
Now that you understand some common terms, let’s talk about wiring configurations. There are two main wiring configurations used for trailer 7 plug connectors: the RV style and the commercial style.
RV Style
The RV style wiring configuration is the most common for trailers used for recreational purposes. This wiring configuration uses a 7-way blade connector and is typically found on travel trailers, fifth wheels, and other RVs.
Pin 1 – Ground
The first pin on an RV style 7 plug connector is used for the ground wire. This wire is typically white and is connected to the trailer’s frame to provide a safe path for electricity to flow back to its source.
Pin 2 – Power
The second pin on an RV style 7 plug connector is used for power. This pin is typically black and is used to power the trailer’s running lights.
Pin 3 – Power
The third pin on an RV style 7 plug connector is also used for power. This pin is typically red and is used to power the trailer’s brake lights.
Pin 4 – Power
The fourth pin on an RV style 7 plug connector is used for power as well. This pin is typically green and is used to power the trailer’s right turn signal and brake light.
Pin 5 – Power
The fifth pin on an RV style 7 plug connector is also used for power. This pin is typically yellow and is used to power the trailer’s left turn signal and brake light.
Pin 6 – Brakes
The sixth pin on an RV style 7 plug connector is used for trailer brakes. This pin is typically blue and is used to control the trailer’s electric brakes.
Pin 7 – Auxiliary
The seventh and final pin on an RV style 7 plug connector is used for auxiliary power. This pin is typically purple and can be used to power other accessories on the trailer, such as interior lights or electric jacks.
Commercial Style
The commercial style wiring configuration is typically used for trailers that are used for commercial purposes, such as hauling cargo or heavy equipment. This wiring configuration uses a 7-pin connector and is usually found on flatbed trailers or other commercial trailers.
Pin 1 – Ground
The first pin on a commercial style 7 plug connector is used for the ground wire, just like with the RV style configuration.
Pin 2 – Power
The second pin on a commercial style 7 plug connector is also used for power. This pin is typically red and is used to power the trailer’s stop lights.
Pin 3 – Power
The third pin on a commercial style 7 plug connector is used for power as well. This pin is typically black and is used to power the trailer’s tail lights.
Pin 4 – Turn Signals
The fourth pin on a commercial style 7 plug connector is used for the trailer’s left turn signal.
Pin 5 – Turn Signals
The fifth pin on a commercial style 7 plug connector is used for the trailer’s right turn signal.
Pin 6 – Brakes
The sixth pin on a commercial style 7 plug connector is used for trailer brakes, just like with the RV style configuration.
Pin 7 – Auxiliary
The seventh and final pin on a commercial style 7 plug connector is used for auxiliary power, just like with the RV style configuration.
FAQ
What tools do I need to wire a trailer’s 7 plug connector?
Wiring a trailer’s 7 plug connector requires a few basic tools, including wire cutters, wire strippers, and a crimping tool. You may also need a voltage tester to ensure that the wiring is properly connected and working.
What’s the difference between a 4 plug and a 7 plug connector?
A 4 plug connector is typically used for trailers that don’t have brakes or running lights, while a 7 plug connector is used for trailers that do have these components. The 7 plug connector provides more wiring options for different components, such as brake lights and turn signals.
Can I wire my trailer without a professional?
Wiring a trailer’s 7 plug connector can be done without a professional, but it’s important to have some electrical knowledge and experience. If you’re unsure about the wiring process or don’t have experience with electrical work, it’s best to seek professional help.
What should I do if my trailer’s lights aren’t working?
If your trailer’s lights aren’t working, the first step is to check the wiring connections and ensure that everything is properly connected. You may also need to check the fuses or replace bulbs if they’re burned out. If you’re unsure about the problem, seek professional help to avoid further damage or injury.
Can I use a 7 plug adapter to connect my RV to a tow vehicle with a 4 plug connector?
Yes, you can use a 7 plug adapter to connect your RV to a tow vehicle with a 4 plug connector. The adapter will allow you to use more wiring options and connect all necessary components for safe towing.
How do I maintain my trailer’s wiring system?
To maintain your trailer’s wiring system, it’s important to regularly inspect the wiring connections and ensure that everything is properly connected and functioning. You should also avoid exposing the wiring to water or other harsh elements and keep the wiring protected and secure during use.
Conclusion
Wiring a trailer’s 7 plug connector may seem overwhelming, but it’s an important process to ensure safe towing. Understanding common terms and wiring configurations can help simplify the process and ensure that you’re using the right equipment and tools. If you’re unsure about the wiring process, seek professional help to avoid injury or damage to your trailer or tow vehicle.
| Pin | Color | Function (RV Style) | Function (Commercial Style) |
|---|---|---|---|
| 1 | White | Ground | Ground |
| 2 | Black | Power (Running Lights) | Power (Stop Lights) |
| 3 | Red | Power (Brake Lights) | N/A |
| 4 | Green | Power (Right Turn Signal and Brake Light) | Right Turn Signal |
| 5 | Yellow | Power (Left Turn Signal and Brake Light) | Left Turn Signal |
| 6 | Blue | Brakes | Brakes |
| 7 | Purple | Auxiliary Power | Auxiliary Power |
