Found the problem. The blue wire in the factory harness is grounding out somewhere between both ends. According to the FSM it doesn't have any splices in it just a plug at the firewall harness. I cut the blue wire coming out of the control box and connected a long jumper wire to it then ran the jumper wire straight to the trailer and sure enough the brakes work fine. So for a quick fix I ran the jumper along the frame to the back of the receiver plug and all is normal now.
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Current boat(s):
1985 V-20 Cuddy/ 470 IB/OB
1972 Egg Harbor 38’ Sedan/ 454 Crusaders
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