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Originally Posted by lance-n
My h3 came with two adapters so that the trailer wiring harness on the back next to the hitch can connect with the trailer plug.
when you do this, the brake lights and turn signals should be transmitted automatically to the appropriate lights on the trailer.
If you have a trailer equipped with surge brakes, they should function automatically.
That's my 2 cents
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One of the adapters is a cig liter socket.
The other has the flat 4 pin adapter.
surge brakes may work, need to find out exactly how the are set up. some has a 'back up' block or lock to flip so u can back it up w/o brakes working.
Thanks on posting the brake controller wiring info, I've got to put one in for the horse trailer.