05 Ford Brake controler error messages

[richfaa]

I have the TBC system in my 05 350 and I am all green now..The trouble is most likely the trailer..Look at the connector and check for rust or corrosion.You need to have a clean amd well grounded connection TBC to RV. The first time I hooked it up this year I did get a trailer disconnect Msg I cleaned the connector contacts up and all was well. By the way is your 05 350 gas or diesel and how does it pull that 3685FL.