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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. 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. 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. 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. 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. 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 wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector where the wires mount to the terminals starting at the notch at the top and working clockwise. 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. 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. 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.