7-Pin Commercial Trailer Wiring Diagram:
Pin No. Function:
1. Left Turn Signal and Stoplight
2. Tail Lights
3. Ground
4. Right Turn Signal and Stoplight
5. Reverse Lights
6. Brake Controller Output
7. Auxiliary Power
Trailer Socket: 7-pin
Trailer Plug :7-pin
Here are some additional notes about the wiring:
- Pin 3 (ground) must be connected to a good ground on the trailer frame.
- Pin 6 (brake controller output) is used for electric brake controllers. If your trailer does not have electric brakes, you do not need to connect this pin.
- Pin 7 (auxiliary power) is used for providing power to devices on the trailer, such as lights, fans, or air compressors.
- The wire gauge used should be appropriate for the amperage draw of the devices being used.
Always refer to the specific instructions and documentation that came with your trailer and towing vehicle for accurate and detailed information on wiring.
