A 7 way trailer plug has 7 pins or wires to connect various lighting functions. Here is what each wire controls: Pin 1 - Electric Brakes. Pin 2 - Tail Lights and Marker Lights. Pin 3 - Ground (for all circuits) Pin 4 - Right Turn and Stop Signal. Pin 5 - Left Turn and Stop Signal. Pin 6 - Running Lights. Pin 7 - Back Up Lights.. Step 4: Connect the wires. Now, connect the prepared wires to their corresponding terminals on the 7 pin trailer plug. Use a screwdriver to tighten the screws on the terminals, ensuring a secure and proper connection. Double-check that each wire is connected to its correct terminal based on the wiring configuration.

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The 7 way plug wiring diagram typically includes pins for the following functions: ground, running lights, left turn/brake, right turn/brake, electric brakes, auxiliary, and backup lights. Each of these functions has a designated pin on the plug, which helps ensure that the correct connections are made.. The 7 way trailer plug consists of seven pins or connections, each serving a specific purpose. The diagram for a 7 way trailer plug shows how these pins are arranged and what they are used for: Pin 1:Ground - This pin is used to provide a ground connection for the trailer. Pin 2:Electric Brakes - This pin is used to supply power to the.