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Did you just install the trailer brake controller?
Correct they are pre wired from Ford. They aren't always installed at the factory. That's why I'm asking if you just installed the trailer brake module? Also are you using a 7pin trailer plug?
I'm not trying to say you don't know how to pull trailers. For that I am sorry. In order to give you correct information I have to ask questions. Some people try and add this themselves from a Ford dealer. It works but it needs to be programmed by a dealer. The other reason I asked what pin is 4,5, and some 6 pin connectors won't register. When these re new the vehicle doesn't ship the trailer charge fuse or the trailer tow charge relay. If the trailer tow charge relay isn't working correctly the trailer will show it isn't connected.