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How To Add 4-Way Trailer Connector On Trailer With 5 Wires

Question:

My trailer has no plug just bare wires two green wires go to the right side yellow and brown going to left side and white for a ground, my vehicle has a standard 4 wire white yellow green and brown how can I wire in a four pin connector on the trailer to plug into the truck?

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Expert Reply:

I would be happy to help walk you through how to install a 4-way connector on your trailer.

Since your trailer has two green wires going down the right side of the trailer, that tells me that one of the wires is powering your running lights. The easiest way to test which of the wires is for the running lights, connect the white ground wire and one of the green wires to a 12v battery and see what lights come on.

To install a 4-way trailer connector like the # W787264 you will need to connect the green wire for the running lights, and the brown wire from the left side of the trailer to the brown wire on the connector, and then connect the rest of the wires color to color using heat shrink butt connectors # 05731-5 for a weather tight connection.

I included a video of the # W787264 being installed, and a link to a helpful article to trailer wiring for you to take a look at.

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Samuel C

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