Dunefreak
My adaptor is a four flat. The four conncetors are left, right, tail and ground. There is no electrical connection to surge brakes. I am not sure what the fifth connection is for.
My trailer manual states that to prevent the brakes from engageing while backing-up, you have to insert a pin into the coupler that prevents the coupler from moving backwards. Surge brakes work by using the weight of the boat (when the truck slows down) to push on the copuler which contains a master cylinder which forces hydraulic fluid to the brake cylinders.
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