It seems odd that Ford is making a different wiring harness for with and without tow package. Not to mention the differences by trim package. That seems like a really expensive operation at the assembly of these vehicles just for the tow pack. . Why go to that effort?
Maybe someone with factory tow could do some exploratory digging and see how the tow wiring is done at the factory level.
Cheaper in the long run to have different harnesses. Ford deals in volume and the long game.
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