A 7 pin light plug wiring diagram is essential for anyone with a trailer or caravan. The 7 pin plug connects the electrical components of the trailer to the towing vehicle. A proper wiring diagram ensures that the lights, brakes, and signal systems on the trailer are fully operational while being towed.
The 7 Pin Plug
The 7 pin plug has seven pins or connections that are used to deliver power to the electrical components of the trailer. The plug is usually located on the rear of the trailer, on the driver’s side.
Pin 1: Left Indicator
Pin 1 delivers power to the left indicator or turn signal light on the trailer. The left indicator is usually located on the side of the trailer that faces the driver.
Pin 2: Rear Fog Light
Pin 2 delivers power to the rear fog light on the trailer. The rear fog light is used in situations where visibility is poor, such as in heavy rain or fog.
Pin 3: Earth/ Ground
Pin 3 is used to ground or earth the electrical system on the trailer. This ensures that the electrical system is properly grounded and that power is delivered efficiently.
Pin 4: Right Indicator
Pin 4 delivers power to the right indicator or turn signal light on the trailer. The right indicator is usually located on the side of the trailer that faces away from the driver.
Pin 5: Brake Light
Pin 5 delivers power to the brake light on the trailer. The brake light is activated when the brakes are applied on the towing vehicle.
Pin 6: Reverse/ Backup Light
Pin 6 delivers power to the reverse or backup light on the trailer. The reverse light is activated when the driver shifts the towing vehicle into reverse gear.
Pin 7: 12V Battery
Pin 7 delivers power from the towing vehicle’s battery to the battery on the trailer. This ensures that the battery on the trailer is fully charged and operational.
Wiring Diagram
The following is a wiring diagram for a 7 pin plug:
| Pin | Wire Colour | Function |
|---|---|---|
| 1 | Brown | Left Indicator |
| 2 | Blue | Rear Fog Light |
| 3 | White | Earth/ Ground |
| 4 | Green | Right Indicator |
| 5 | Yellow | Brake Light |
| 6 | Black | Reverse/ Backup Light |
| 7 | Red | 12V Battery |
Frequently Asked Questions
What is a 7 pin plug?
A 7 pin plug is an electrical connector that is used to connect the electrical components of a trailer to the towing vehicle.
What does a 7 pin plug do?
A 7 pin plug delivers power to the lights, brakes, and signal systems on the trailer, ensuring that they are operational while being towed.
How do I wire a 7 pin plug?
You can wire a 7 pin plug by following a wiring diagram and connecting the appropriate wires to the correct pins or connections.
What are the different pins on a 7 pin plug used for?
The different pins on a 7 pin plug are used to deliver power to the left and right indicators, rear fog light, brake light, reverse or backup light, 12V battery, and ground or earth the electrical system on the trailer.
Why is a wiring diagram important?
A wiring diagram is important because it ensures that the electrical components on the trailer are wired correctly, ensuring that they are fully operational while being towed.
