Round Trailer Plug Wiring Diagram

By | February 1, 2021



Understanding Your Round Trailer Plug Wiring Diagram



Connecting a trailer to your vehicle is an essential skill for any driver. Knowing the right way to wire up your trailer can ensure that it functions correctly and safely each time. A trailer wiring diagram outlines the most efficient way to wire up the electrical system of your trailer. It is important to note that all the parts of the wiring diagram have to be compatible with one another before connecting them. One of the more common Connectors is the round trailer plug wiring diagram.

Knowing how to decode the round trailer plug wiring diagram is a key step in understanding the workings of your trailer. In this article, we’re going to provide an in-depth overview of the round trailer plug wiring diagram and how it works. You’ll learn about each connection point and what the hooked up wires look like from the outside of the plug. After reading this article, you’ll have a better understanding of how the various components of the wiring diagrams work together and know how to correctly connect and operate a trailer's electrical system.

The Basics of Round Trailer Plug Wiring Diagrams



Wiring diagrams are representations of the connections between components, sensors, and switches inside a trailer. The symbols used in a wiring diagram help you recognize and remember the order they should be connected in. They also provide a visual representation of the connections, helping to identify issues if the connect is not right.

A round trailer plug wiring diagram will often feature seven terminals and colors. Each terminal serves a unique purpose and indicates which wire has to be connected in that specific terminal. Using a wiring diagram, you will be able to determine the flow of electricity; this would include the locations of input and output connections, power grounds, and possibly battery connections.

A Closer Look at the Seven Terminals



There are typically 7 terminals associated with round trailer plugs and wiring diagrams. Understanding the function of each can give a better understanding of the wiring and how everything fits together.

Terminal 1: Battery +


The first terminal found in a round trailer plug wiring diagram is the + terminal for the battery. This is the connection between the vehicle and the battery of the trailer. This will be connected to the positive terminal of the battery, which needs to be as close as possible to the generator in order for the trailer lights to work.

Terminal 2: Brake Lights


The second terminal is for the brake lights. In a trailer setup, the brake lights are typically wired directly to the battery and are not powered by the generator. Wiring them up in the proper manner helps the driver reduce their speed by engaging the brakes when the car stops.

The other five terminals are:

  • Terminal 3: Tail Lights

  • Terminal 4: Left Turn Signal

  • Terminal 5: Right Turn Signal

  • Terminal 6: Reverse Lights

  • Terminal 7: Auxiliary Power



Important Notes About Safety



Ensuring that the wiring of your trailer is correct is key to its safety. When wiring any trailer, it is important to make sure that both the positive and negative terminals are properly connected. If they are not connected correctly, the electrical system can short out and cause damage to your vehicle and trailer. Also, always make sure that the appropriate fuse or circuit breaker is in place to avoid any potential electrical fires.

It is always best practice to consult a wiring diagram when attempting to do any wiring on your trailer. This ensures that the wiring of your trailer is done correctly and safely. Wiring diagrams will provide the guidance you need to efficiently connect the various components of your electrical system, allowing you to be sure everything is safe and functioning correctly.

Making Sense of Your Round Trailer Plug Wiring Diagram


A round trailer plug wiring diagram can help make sure the electrical system of your trailer is set up correctly and operating safely. Knowing the basic functions of the seven terminals and how to properly connect the wiring can lead to a successful trailer set-up. While consulting a wiring diagram is the best practice, knowing the basics of round trailer plug wiring diagrams can provide some insight into understanding your trailer better.


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