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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. Wiring Plug Diagram A Helpful Chart And Wire Color Key Displaying – 7 Pin Semi Trailer Wiring Diagram by Bismillah. To begin with, understanding the diagram of cables for trailer will be helpful during troubleshooting. How to Install Trailer Wiring on Your Vehicle. with Color-Coded Diagrams! Any vehicle towing a trailer requires a trailer wiring harness to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. Commercial Truck and TrailerWiring Diagram. Light Duty Non Commercial Truck, Fifth Wheel and Travel Trailer Wiring Diagram. Note the ways to convert from 7-Pin Commercial Plug to the 7-Blade Light Duty Plug is covered inTaillight Converters. This drawing from Mark Bruss shows the relationship of the 7-round to 7-flat plugs and how only three. 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. 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. 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.