How to Wire Brake Magnets on a Car Hauler Trailer to a new 7-Way RV Connector

Question:

I have bought an old car trailer that has breaks on both axels but they have put new wiring for the lights on a 4-plug. I am going to rewire the whole trailer I need to know witch wires are for the breaks mine have two wires comming out of each break I know the blue wire is one what other wire do I use I will be using thew 7 plug?

asked by: Phillip R

Expert Reply:

Each of your brake assemblies will have two wires exiting the brake magnet. One wire would connect to the brake output wire, the other would ground to the trailer frame. These brake magnets have no polarity, it does not matter which is grounded and which connects to the brake output circuit.

We have a video that details brake magnet wiring and 7-Way trailer connector, # PK12706, installation for you to review, see link. We use 10 gauge wire, # 10-2-1, to wire the brake magnets to the trailer connector.

At the top of our wiring page, see link, there is a diagram of trailer brake wiring on a dual axle trailer.

expert reply by: Mike L