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How to Wire a 7-Pin Trailer Plug All makes and models are designed differently, so you’ll need to have a service or repair manual that includes wiring diagrams for your specific make and model. The following instructions describe the wiring of a basic, traditional plug that is commonly used on pickup trucks. RV and Commercial 7-wire. When referencing the 7-Way RV Plug diagram, make sure you are looking at the plug the way the diagram is showing you. Having the wires backward will cause problems. Keep in mind that it isn’t always as simple as matching the colors like you might be inclined to do. Match the functions, not the colors. Make sure your ground wire, which is. Trailer Wiring Diagrams Trailer Wiring Connectors. Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller, backup lights, or a 12V power supply for a winch or interior trailer lights. I do have a handy trailer wiring FAQ article that would be perfect for you. I have included a link to it. I have also included a picture that shows the typical wiring diagram of a 7-Way round pin trailer side connector. As you can see, the 7-way round pin trailer connectors do not use the typical pin functions. 7 Way Plug Wiring Diagram Standard Wiring* Post Purpose Wire Color TM Park Light Green (+) Battery Feed Black RT Right Turn/Brake Light Brown LT Left Turn/Brake Light Red S Trailer Electric Brakes Blue GD Ground White A Accessory Yellow This is the most common (Standard) wiring scheme for RV Plugs and the one used by major auto manufacturers today. In the Trailer Wiring Diagram and Connector Application Chart below, use the first 5 pins, and ignore the rest. If your truck has a built-in 7-pin socket, but you only need 5 of the pins. Use the 7-pin connector anyway (see below), and just leave out the last 2 wires. Above we have describes the main types of trailer wiring diagrams. Below is the generic schematic of how the wiring goes. 4 pin trailer wiring diagram. This type of connector is normally found on UTVs, ATVs and trailers that do not have their own braking system. Note, that this type of 4-pin connector is less common, that 4-pin flat connector. The trailer wiring diagrams listed below, should help identify any wiring issues you may have with your trailer. 4 & 5 Way Flat Connector Wiring Diagrams. 4-way and 5-way flat connectors use color-coded wires and are available in a variety of lengths. They can be purchased as a standalone plug for the truck or trailer, or as a complete loop. Collection of semi trailer wiring schematic. A wiring diagram is a simplified standard photographic representation of an electric circuit. It reveals the parts of the circuit as streamlined forms, as well as the power and signal connections in between the tools. Trailer plug connector diagrams for electrical towing connectors. View diagrams for our 4-way, 6-way & 7-way plugs. Trailer Plug Wiring. These diagrams will help ensure you wire your PJ Trailer using the correct standard for either a 4-way and 7-way plug wiring systems.