A 7 pin trailer wiring diagram is a schematic that shows the pinout and function of each wire in a 7-way round trailer connector. The standard 7-pin connector contains the following wires and functions: The diagram uses color coding and labeling to identify the purpose of each pin's wire. It traces the path of the wires from the connector.. The 7-Way Trailer Plug is around 2″ diameter connector that allows an additional pin for an auxiliary 12-volt power or backup lights. It is usually used for towing heavy-duty cargo trailers, aluminum trailers, dump trailers, utility / landscape trailers, equipment trailers, open car haulers and enclosed car haulers.

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7-ways are some of the most common harnesses found on trailers. 7-ways provide the required running lights, turn signals, brake lights, and ground for the trailer. In addition, they provide three additional pins for a 12V hot lead, electric brakes, and reverse lights. Trailer wiring can be one of the most intimidating components of your towing.. Understanding the 7-Pin Trailer Plug Wiring Diagram and Color Code. The color code for a seven-way trailer plug helps users correctly wire the connections for various functions. Here is a standard color code and a diagram for a 7-way trailer plug: White: Ground; Blue: Electric brakes; Green: Right turn signal and brake light