Not sure if you have a different brake system than I do? Mine is activebrake from Texas (Carlise looks the same but different) Anyway, my Ford controller shows "trailer disconnected" quite often during transport. Have checked connections and used 2 different plugs with no improvement. I think the next step might be to replace the Ford Controller with something else.
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2008 F-450
Aftermarket Brake Controller
2007 ES 36RE3 # 3702
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