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Old 06-07-2016, 06:51 PM   #12
bevedfelker
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Brand: Thor Motor Coach
Model: 2015 Vegas 24.1
State: Pennsylvania
Posts: 1,468
THOR #2601
If you look under the rear of you coach there should be a harness coming out of the 7-way plug. The factory should have wired the lights so there should be wires going to pins 1, 3, 5, and 6. They might have wired the 12VDC pin 4. They also should have put a blue wire on pin 2 for the brake controller; however, (as on my 2015 Vegas) the wire probably only runs to somewhere behind the fuel tank and is capped off.

If you are going to install the brake controller, you will have to wire it to the chassis electrical system under the hood for 12 vdc power, and a ground. You'll also have to wire in an in-line fuse for the 12VDC going to the brake controller. Then you will have to wire a (blue preferably) a wire for the brake controller brake signal and run it from under the dash to the engine compartment and then back along the chassis to splice in to the blue wire that they have capped off from the 7-way connector.

Do not be surprised if you have to completely rewire the 7-way because several owners reported when they went to wire in a brake controller they found the factory wiring for the lights was completely wrong.

You can buy a trailer simulator adapter that you plug in the 7-way and it will check the light wiring, power, ground, and brake signal (once you finish wiring it in.

If this sounds like a little too much, check with your dealer to have the brake controller wired in.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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