When it comes to towing a trailer, a reliable wiring system is crucial for keeping your vehicle and trailer connected properly. One common wiring system used in Australia and New Zealand is the 7 pin flat connector. In this article, we will provide a comprehensive guide on the 7 pin flat trailer connector wiring diagram, including its purpose, how it works, and common faults you may experience.
Purpose of the 7 Pin Flat Trailer Connector
The 7 pin flat trailer connector is designed to supply power to your trailer’s lights, brakes, and other electrical components. The connector enables your vehicle’s electrical system to transfer power to your trailer’s electrical system, allowing you to safely tow your trailer and control its operation.
The 7 pin flat trailer connector consists of seven pins that are colour-coded to indicate their function. Each pin is designed to carry a specific type of electrical signal, ensuring that the power is delivered to the correct component on your trailer.
7 Pin Flat Trailer Connector Wiring Diagram
Below is an overview of the 7 pin flat trailer connector wiring diagram:
| Pin | Name | Colour | Function |
|---|---|---|---|
| 1 | Left Indicator | Yellow | Connects to left-hand indicator on the trailer |
| 2 | Reverse Light | Black | Connects to reverse lights on the trailer |
| 3 | Earth | White | Connects to the earth wire on the trailer |
| 4 | Right Indicator | Green | Connects to right-hand indicator on the trailer |
| 5 | Electric Brake | Blue | Connects to electric brake controller on the vehicle, which applies the brakes on the trailer |
| 6 | Tail Light | Brown | Connects to tail lights on the trailer, which are always on when the lights are switched on |
| 7 | Battery Charge | Red | Connects to the positive terminal of the battery on the trailer, which charges the battery while towing |
How the 7 Pin Flat Trailer Connector Works
The 7 pin flat trailer connector works by transferring power from your vehicle’s electrical system to your trailer’s electrical system. When you plug your trailer into your vehicle, each pin on the connector makes contact with a corresponding pin on your vehicle’s socket, establishing an electrical connection.
As you operate your vehicle, the electrical signals for each component pass through the appropriate pin on the connector, allowing the power to reach the correct component on your trailer. For example, when you use your vehicle’s indicators, the signals are sent through pins 1 and 4 to the corresponding indicators on the trailer.
Common Faults with the 7 Pin Flat Trailer Connector
Like any electrical system, the 7 pin flat trailer connector can experience faults or failures. Here are some of the most common faults:
Blown Fuses
If your trailer’s lights or brakes stop working, there may be a blown fuse in your vehicle’s electrical system. Check the fuses and replace any that are blown.
Crossed Wires
If the wiring is not connected properly, or if the wires get crossed, your trailer’s lights or brakes may not work correctly. Check the wiring and connections, and ensure that each wire is connected to the correct pin on the connector.
Corrosion
Over time, the contacts on the connector can become corroded, causing poor electrical connections. Clean the contacts with a wire brush or sandpaper to remove any corrosion, and apply dielectric grease to prevent further corrosion.
Broken Wires
If one of the wires in the connector breaks, your trailer’s lights or brakes may not work. Check the wires for damage, and replace any that are broken.
FAQ
What type of vehicles use the 7 pin flat trailer connector?
The 7 pin flat trailer connector is commonly used in Australia and New Zealand on vehicles such as cars, SUVs, and trucks that are equipped with a tow bar.
Do I need any special tools to install the 7 pin flat trailer connector?
Installing a 7 pin flat trailer connector is a relatively simple process that requires only a few basic tools, such as a wire stripper and crimping tool. However, if you are not confident in your wiring abilities, it is recommended that you seek the assistance of a professional.
What should I do if my trailer’s lights or brakes stop working?
If your trailer’s lights or brakes stop working, start by checking the fuses in your vehicle’s electrical system. If the fuses are not the problem, check the wiring connections and ensure that each wire is connected to the correct pin on the connector. If you cannot find the problem or are not confident in your abilities to fix it, seek the assistance of a professional.
Can I use a 7 pin flat trailer connector for a caravan or camper trailer?
Yes, you can use a 7 pin flat trailer connector for a caravan or camper trailer, as long as the wiring matches the needs of your particular trailer. However, some caravan and camper trailers may require a different type of connector, such as a 12 pin flat or round connector. Check your trailer’s wiring requirements before installing a connector.
Is it legal to tow a trailer without a working electrical system?
No, it is not legal to tow a trailer without a working electrical system. Your trailer must have functioning lights and brakes to comply with road safety regulations. Failure to comply can result in fines or other penalties.
Conclusion
The 7 pin flat trailer connector is an essential part of any towing system, enabling you to safely tow your trailer and keep it connected to your vehicle’s electrical system. By understanding the wiring diagram, how it works, and common faults, you can ensure that your trailer’s electrical system is reliable and functional, and enjoy a safe and hassle-free towing experience.
