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Old 10-16-2013, 02:27 PM   #1
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Exclamation TBC Problem

I have a 2008 F450 with the integrated brake control system. I am not getting power to the brakes. I have checked all fuses that is related to the trailer lights everything. I have used both the bed and the bumper plugs with no results. This is my biggest confusion. If I use use the manual slide the brakes lock I have tested by trying to pull against it and the trailer tires lock up. What am I missing?
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Old 10-16-2013, 02:32 PM   #2
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OH I forgot to add this info. I have hooked the camper to my 2001 F250 and the brakes work when I apply the brakes I can hear the coils activate.
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Old 10-20-2013, 03:16 PM   #3
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I have no Ford experience, but can tell you that when I bought my new Chevy Suburban, there were two wires under the hood that had to be unwrapped from the wire harness and hooked up into the fuse block/power center. One wire supplied power to the IBC and the other supplied power to the constant 12V feed to the 7-pin plug. Check your owners manual to see if it references anything about something like this, or ask a decent mechanic....or hopefully someone on this board will have an idea to share.
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Old 10-20-2013, 03:21 PM   #4
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Is there a power & gain adjustment?
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Old 10-21-2013, 09:00 AM   #5
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OC the Ford IBC units have no power switch, just a gain adjustment and the manual control. Seeing as he has tried the manual control and it works it would seem to be a problem with the brake sensing ccts related to the brake pedal. Although if the gain is set to 0.

To the OP did you check the big square pinkish 30amp fuse (Fuse number 5) in the power distribution box under the hood?
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Old 10-21-2013, 01:26 PM   #6
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I called the Ford dealer and talked to them about this issue and this is what I was told. The F450 is a little different the the other model truck when it comes to the built in TBC as it uses pressure to activate the brake controller. The harder you push it the more power is applied to the trailer. So I am the kinda person that starts applying the brake several hundred feet from a stop if I can. I will update this if I find out more.
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