How Do I Wire My Trailer For Brakes That Already Has Brakes  

Question:

Expert Reply:

What you will need to do is run a wire from the front of the trailer to each brake location. You will need 10 gauge blue primary wire, part # 10-1-1, which is sold by the foot. I would recommend measuring where you will be running the wire to order the correct amount, and it would be a good idea to order a couple extra feet so that you are not short of wiring.

Start by leaving the wire loose at the front of the trailer and run to the farthest rear brake assembly on either side. Cut the wire to length and connect to the power wire of the brake using a butt connector. To connect the other brake assemblies run wire, part # 10-1-1 from the power wire of each individual brake assembly and tap into 1st wire that you ran back using quick splices, part # SWC501915-1. After making all the connections at the brake assemblies, you will want to wrap electrical tape over all the connection points. Each brake assembly will have 2 wires, it does not matter which wire you use as the power wire, the other wire will be connected to the frame of the trailer as the ground.

After connecting the wires, you will need to connect the main wire at the tongue of the trailer. You will need to wire the blue wire into the 7-way connector. To do this you will need to take apart your 7-way connector and connect the wire to the inside tab of the 7-way that is labeled blue using a ring terminal. Since you will have the 7-way connector apart, I would recommend going ahead and replacing it using, Pollak Black Plastic 7-pole part # PK12706.

I have linked a video showing how to re-connect the wires when replacing 7-way connector as well as a picture showing the connection points on the inside of the 7-way connector and a diagram for running wires to the brake assemblies.

expert reply by: Reno H

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