Trailer wiring can be a confusing task if you’re not familiar with its systems. Having a good understanding of the wiring can help prevent any issues that may arise while towing. In this article, we will be discussing the 7 spade trailer plug wiring diagram, a widely used system in the industry. We will cover the basic components and their respective functions, as well as the color codes for easy identification.
Basic Components
The 7 spade trailer plug system comprises seven pins or prongs, which are connected to different components of the trailer. The pins are arranged in a specific order, starting from the bottom right and moving counterclockwise.
Pin 1: Ground
The ground pin is usually the top pin of the plug. It connects the trailer’s electrical system to the towing vehicle’s chassis to create a complete circuit. The ground pin is represented by the color white on the wiring diagram.
Pin 2: Reverse Lights
The second pin is for the reverse lights of the trailer. It connects to the backup lights of the towing vehicle and is represented by the color green.
Pin 3: Tail Lights
The third pin is for the tail lights of the trailer. It connects to the running lights of the towing vehicle and is represented by the color brown.
Pin 4: Left Turn/Brake Lights
The fourth pin is for the left turn and brake lights of the trailer. It connects to the left turn and brake lights of the towing vehicle and is represented by the color yellow.
Pin 5: Right Turn/Brake Lights
The fifth pin is for the right turn and brake lights of the trailer. It connects to the right turn and brake lights of the towing vehicle and is represented by the color green.
Pin 6: Electric Brake Controller
The sixth pin is used for trailer brakes. It connects to the output of an electric brake controller and is represented by the color blue.
Pin 7: 12V Auxiliary Power
The last pin is for 12-volt auxiliary power. It can be used to power accessories in the trailer like interior lights, refrigerators, or inverters. It is represented by the color black.
Wiring Diagram
Below is a wiring diagram for the 7 spade trailer plug system. It shows the pins and their respective colors. You can use this diagram as a guide when installing or troubleshooting your trailer’s wiring.
| Pin Number | Wire Color | Function |
|---|---|---|
| 1 | White | Ground |
| 2 | Green | Reverse Lights |
| 3 | Brown | Tail Lights |
| 4 | Yellow | Left Turn/Brake Lights |
| 5 | Green | Right Turn/Brake Lights |
| 6 | Blue | Electric Brake Controller |
| 7 | Black | 12V Auxiliary Power |
FAQ
Q: What is the 7 spade trailer plug system?
A: The 7 spade trailer plug system is a wiring system used to connect the electrical components of a trailer to the towing vehicle. It comprises seven pins or prongs that connect to different components of the trailer.
Q: What is the function of the ground pin?
A: The ground pin is used to create a complete circuit between the trailer’s electrical system and the towing vehicle’s chassis.
Q: What is the purpose of the 12V auxiliary power pin?
A: The 12V auxiliary power pin can be used to power accessories in the trailer like interior lights, refrigerators, or inverters.
Q: What color represents the left turn and brake lights pin?
A: The left turn and brake lights pin is represented by the color yellow.
Q: What is the purpose of the electric brake controller pin?
A: The electric brake controller pin is used to connect the trailer brakes to an electric brake controller that’s installed in the towing vehicle.
Understanding the 7 spade trailer plug wiring diagram is essential for safe towing. By correctly wiring your trailer, you can avoid any issues while traveling, ensuring a smooth journey for you and your cargo.
