Re: 2006 F-250 TBC problem?
That's interesting. I gather this is Ford's built in trailer brake controller?
If it is, you'll have to find the wiring diagram and make sure everything inside is connected properly. Manual control is made to override auto control so I would bet that there's a wiring problem, possibly a short, inside the controller itself.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!