Understanding 7-Way Trailer Plug Wiring Diagrams

1 min read

Phillips 7 Way Trailer Plug Wiring Diagram Free Wiring Diagram

If you’ve ever had to rewire a trailer with a 7-way plug, you know how overwhelming it can be. Trying to make sense of the diagrams and instructions provided can be tricky. But with a bit of understanding, you’ll be able to tackle any job with confidence. In this article, we’ll break down the basics of a 7-way trailer plug wiring diagram.

How to Read a 7-Way Plug Wiring Diagram

A 7-way plug wiring diagram is a diagram that shows the wiring of a 7-way trailer plug. It shows the placement of the seven wires that connect the trailer plug to the vehicle. Each wire has a letter or number to indicate its purpose. For example, the “L” wire stands for left turn signal, the “A” wire stands for auxiliary, and so on.

The diagram also shows the color of each wire and its location on the plug. This is important to know if you’re replacing a wiring harness or connecting a new trailer plug. Knowing the colors and the locations of the wires will help you make the right connections.

Wiring the 7-Way Plug

Wiring the 7-way plug is a simple process, but it’s important to get it right. Start by connecting the white wire to the ground terminal. Next, connect the yellow wire to the left turn signal terminal, and the green wire to the right turn signal terminal. Then, connect the brown wire to the auxiliary terminal, the red wire to the brake terminal, and the blue wire to the reverse terminal.

Finally, connect the black wire to the power terminal. Make sure to double-check your connections before plugging the plug in. Once you have everything connected, you can plug the 7-way plug into the vehicle’s trailer receptacle.


Understanding a 7-way plug wiring diagram can seem intimidating, but it doesn’t have to be. With a bit of patience and a little understanding, you can easily make the correct connections and get your trailer up and running. Just remember to take your time and double-check your connections. That way, you can rest assured that you’ve got a safe and reliable connection.