Commercial trailers are used for various purposes such as transporting goods, livestock, or heavy equipment. These trailers require a power source to operate their lighting system, brakes, and other electrical components. In this article, we will discuss the basic commercial trailer wiring diagram and its components.
Trailer Wiring Connections
The wiring connection of a commercial trailer can be divided into two categories: primary and auxiliary. The primary wiring connection includes the electrical system that connects to the towing vehicle, such as the brake lights, turn signal lights, and running lights. The auxiliary wiring connection includes components such as electric brakes, trailer battery charging, and other non-essential accessories.
The primary wiring connection consists of a seven-way plug that connects to the towing vehicle’s electrical system. The plug has seven wires that serve different functions:
| Wire Color | Function |
|---|---|
| Black | Battery Charge |
| Blue | Electric Brakes |
| Brown | Tail Lights |
| Green | Right Turn Signal & Brake Light |
| Red | Left Turn Signal & Brake Light |
| White | Ground |
| Yellow | Reverse Light |
Electrical Components
Commercial trailers have various electrical components that make up their wiring system. Some of the essential components include:
1. Battery Charging System
The battery charging system is responsible for charging the trailer’s battery while it’s connected to the towing vehicle. This system ensures that the battery is always charged, and the trailer’s electrical components are functioning correctly. The battery charging system consists of a battery charger and a battery isolator.
2. Electric Brake System
The electric brake system provides additional stopping power to the trailer. This system works by applying the trailer’s brakes when the towing vehicle’s brakes are applied. The electric brake system includes a brake controller, brake wire, and brake magnets.
3. Trailer Light System
The trailer light system consists of tail lights, turn signal lights, brake lights, and reverse lights. These lights are essential for ensuring that the trailer is visible to other motorists on the road. They also provide signal indications for turning and stopping.
FAQ
1. Why do I need a wiring diagram for my commercial trailer?
A wiring diagram helps you understand how the trailer’s electrical system works. It also helps you troubleshoot any electrical issues that may arise. A wiring diagram is essential for ensuring that your trailer’s electrical components are functioning correctly and safely.
2. How do I test my trailer’s electrical system?
You can test your trailer’s electrical system by using a multi-meter. Start by testing the electrical connection between the towing vehicle and the trailer. Then, test each of the trailer’s electrical components such as the brake lights, turn signals, and running lights.
3. What should I do if my trailer’s electrical system is not working?
If your trailer’s electrical system is not working correctly, start by checking the fuses and wiring connections. If there are no issues with the fuses or wiring, then the problem may be with the trailer’s electrical components. It’s best to have a professional mechanic diagnose and fix any electrical issues.
4. Can I install a trailer wiring system myself?
Yes, you can install a trailer wiring system yourself if you have the knowledge and tools to do so. However, if you’re not confident in your abilities, it’s best to have a professional mechanic install the wiring system.
5. How often should I inspect my trailer’s electrical system?
You should inspect your trailer’s electrical system at least once a year. It’s also essential to inspect the wiring and electrical components before each trip to ensure that they’re functioning correctly.
Conclusion
A commercial trailer wiring diagram is essential for understanding the trailer’s electrical system. It helps you troubleshoot any issues that may arise and ensures that the electrical components are functioning correctly. By understanding the basic components of a commercial trailer wiring system, you can maintain and repair your trailer’s electrical system safely and efficiently.
