Trailer not registered as connected
Have a 2015 F350 towing a fifth wheel When I used to connect cord to the truck the dash would display "trailer connected" and engage brakes Now that alert is not displayed and brakes do not enga...
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Definitely a wiring problem. I just saw this recently when I 'accidentally' pulled my 7 way cable loose from the trailer. When trying to reconnect the wires, I got the turn signals and brake lights working but couldn't get the connection display or actual brakes to work. The problem was one of the white wires being connected improperly. Sounds like you may have a pair that got disconnected in the junction box at the trailer.
