Squids, not real familar with electric brakes, so all this is a guess. I'd verify that the 7 pin connector is matching the trailer. Do all the lights work properly? That would eliminate 4 wires (right, left, running,& ground). That would leave 3. (Brake, 12 vt constant and reverse). If everything is right on the trailer, verify the truck. We had a new flatbed trailer at work that would tap the brake everytime you turned the right blinker on.
If all that checks out fine, check voltage while under a load. Sometimes those 11.5 's will drop when put to work. Also might try checking without the trailer hooked to truck, this will eliminate any stray grounding through the coupler, which can confuse the issue.
My tahoe only has the 7 pin connector and i had a bad adapter, 7 to 4, that drove me crazy.
Good luck
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04-22-2017, 07:27 AM
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