Trailer wiring can be confusing for those who are not familiar with it. A 7 pin round trailer plug wiring diagram is particularly challenging, but it is not impossible to understand. In this article, we will discuss the wiring diagram for a 7 pin round trailer plug and provide answers to frequently asked questions.
What is a 7 Pin Round Trailer Plug?
A 7 pin round trailer plug is used in connecting an electrical trailer to a towing vehicle. It consists of seven pins that are used for different purposes such as brake lights, turn signals, ground, and more.
Purpose of Each Pin
Each of the seven pins has a specific purpose. These pins include:
| Pin | Purpose |
|---|---|
| 1 | Ground |
| 2 | Electric Brake |
| 3 | Taillights |
| 4 | Left Turn/Brake |
| 5 | Right Turn/Brake |
| 6 | Reverse Lights |
| 7 | Auxiliary (12V power) |
Understanding each pin’s purpose is necessary to correctly wire a 7 pin round trailer plug.
Wiring Diagram for 7 Pin Round Trailer Plug
The wiring diagram for a 7 pin round trailer plug varies depending on the manufacturer. However, they typically follow the same basic wiring pattern. The pins are numbered from 1 to 7 starting from the top left pin when viewed from behind the socket.
Here’s the standard wiring diagram for a 7 pin round trailer plug:
Pin 1: Ground
Pin 2: Electric Brake
Pin 3: Taillights
Pin 4: Left Turn/Brake
Pin 5: Right Turn/Brake
Pin 6: Reverse Lights
Pin 7: Auxiliary (12V power)
Here’s how to wire a 7 pin round trailer plug:
Pin 1: Connect the brown wire to the pin 1 for the ground wire.
Pin 2: Connect the blue wire to pin 2 for electric brakes.
Pin 3: Connect the green wire to pin 3 for the taillights.
Pin 4: Connect the yellow wire to pin 4 for the left turn/brake lights.
Pin 5: Connect the brown wire to pin 5 for the right turn/brake lights.
Pin 6: Connect the white wire to pin 6 for the reverse lights.
Pin 7: Connect the black wire to pin 7 for the auxiliary power.
FAQs
Q1: What is a 7 pin trailer plug used for?
A: A 7 pin trailer plug is used to connect an electrical trailer to a towing vehicle. It allows the towing vehicle to control and power the trailer’s electrical system.
Q2: How do I know which wire goes to which pin on a 7 pin trailer plug?
A: You can use a wiring diagram for your specific trailer plug to identify which wire goes to which pin. Alternatively, you can use a voltage meter to test each wire’s function and label them accordingly.
Q3: Can I use a 7 pin round trailer plug on a 4 pin vehicle?
A: Yes, you can use a 7 pin round trailer plug on a 4 pin vehicle. However, you will need to use an adapter to connect the two different plugs.
Q4: What if I have lost my 7 pin trailer plug’s wiring diagram?
A: You can easily find a wiring diagram online for your specific trailer plug. Alternatively, you can contact the manufacturer of your trailer plug for a copy of the wiring diagram.
Q5: Can I install a 7 pin trailer plug myself?
A: Yes, you can install a 7 pin trailer plug yourself if you have the necessary tools and knowledge. However, it is recommended that you seek the help of a professional to ensure that the wiring is done correctly and safely.
