I'll throw out a few thoughts. First, fuses related to the tow circuits in the fuse block? You've probably already checked there. Next, does the trailer need to be plugged in to place a load, for the circuits to function? Is there a separate "trailer module" needed in that wiring harness for the 7pin to work, if so, is it bad? Lastly, does the computer need to be "flashed" at the dealer, to reset it? Now I'm out of ideas.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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