How to Wire the 3rd Brake Light Logic Module Using an RV 7-Way Trailer Connector  

Question:

Expert Reply:

I understand your frustration with wiring the 3rd Brake Light Logic Module, part # PP20-702. The wiring diagram provided is not very comprehensive. While we do not have another diagram to send, I can explain this in clearer terms.

The module is meant to receive the input from the left and right brake signals from the vehicle and filter them so that the turn signals do not show, leaving only the brake signal.

This is achieved by wiring the two yellow wires into the left and right turn signal functions on your vehicle, and wiring the green wire to the power of the new light.

If you are using the Pollak Black Plastic RV-Style Trailer Connector, part # PK12706, like in the question you referenced, then you will need to wire the two yellow wires of the module to the Left Turn and Stop and the Right Turn and Stop as labelled on the picture I have included (these are labelled with green and yellow lines in the diagram, but just know that it's the two yellow from the module that you'll using. Ignore the fact that green is chosen to represent the Right Turn and Stop in this particular diagram).

After wiring the two yellow wires into those points (it doesn't matter which goes to which, so long as one goes to Left and the other goes to Right), then you will wire the green wire of the module to the 12V source of the new light.

If you are not using a 7-way RV style trailer connector or if you're vehicle's harness is not a 7-way, let me know and I will explain further.

expert reply by: Kef G

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Inside 7-Way Diagram
(click to enlarge)