7 way trailer plug issue...

gijoecam wrote:
The Ford integrated controller is not inertia-based on the '08(I think?) and newer trucks. It uses a pressure signal from the brake system to proportion the brakes to the trailer based on the bias setting.

The system needs three inputs: The brake pressure switch, brake pedal position switch, and the brake pressure transducer.

I don't understand why the dealership can't figure it out... They can scan the TBC inputs, and at the connector, they can monitor the outputs. Skimming over the troubleshooting manual, it shouldn't take them more than a half hour to sort out the problem, honestly. If you've had it in three times, their techs are incompetent and you need someone experienced to sort it out.

But, start with the basics: Battery junction box fuse #5 (30A), Smart Junction Box (under the dash) #33 (10A) (I doubt it's either, but you ALWAYS have to start with the basics)

They connect the scanner, check for codes, and go from there. My guess is that if there are no codes in teh system, there is a compromised wire or pin in a connector somewhere between the TBC in the dash and the back of the truck. Again, they have detailed instruction on how to find it in the troubleshooting and diagnostics manual. They just need to take the time to do it, plain and simple.

Good luck!!

I wouldn't go that far. On these newer computerize vehicles sometimes there is just no fixing.

My brother had a brand new truck that would run fine except when towing his 5th wheel down the interstate. Then it would act up and suddenly not go over 45 mph. He took it to 4 different dealers in two different states and they never could fix it. He ended up trading it in just to get rid of the problem.