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Re: Help with trailer brake
I only use RF wireless electric brake controllers. So, my knowledge on the old school controllers is limited. But, I would think you need constant 12v into the controller and variable 12v out of the controller to the 7-pin (is it the blue wire) trailer plug. Of course grounds are needed as well.
The flat four pin trailer plugs do not have provisions for electric brakes. If your trailer has brakes and a 4 pin connector, then the trailer brakes are hydraulic surge brakes (best for boat trailers).
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