SpeedViktm

Thanks Steve. I'll have a tester/emulator here tomorrow to plug into the socket and be able to see what's what. I did notice that when I clamped the TBC closed that my brake lights do come on, for whatever that's worth. I did not check that inside fuse, thanks for that heads up.

And yeah, tracing wires to see that what I think is supposed to be there is really there is on the short list to check. Lots of people have done this successfully, a few have had problems they never resolved.

SpeedViktm

I haven't crawled under the truck yet, but.... The more I think out loud and try things it seems like anything above 4 pin functionality is not working. I think I need to investigate the main wiring harness more.

Thanks for the help, I'll report back in case it might help someone else.....

EventHorizon

This is what I did. Choose to follow or not.


The Ford 4/7 plug has an electrical connection that plugs in above the spare tire location. Now from a few months of research I did when I was where you're at there can be either 3 or 6 wires leading in to the harness that comes from the front of the truck (6 or 3 only because the ground comes from the 4/7 plug and attached to the frame before the harness connection).


In my findings, if your truck came from the factory with only the flat 4 pin plug for bumper pulling then the harness from the front of the truck only needs 3 wires.


This is the fun part......


For whatever reason some trucks have the 6 wire harness from the front to over the spare tire location. There is no way to find this out with VIN # or model # or anything along that line. There is no rule to say what your truck was to come with (ie. luck of the draw). The only way to find out is drop your spare, find the connector and count how many wires lead in to the "truck" end of that connector.


Good luck

SpeedViktm

Yep, there's my trouble right there.... three wires at the main harness. Unless I want to figure out where those other 3 wires come from/go to (and I don't) then this ain't ever gonna work...

TBC kit in the for sale section soon......

EventHorizon

That sucks. There really is no pattern as to which trucks have the ability to install the Ford TBC. Seen bare bones trim levels that have the wiring and seen top of the line without.


It does seem the only pattern I found was an XLT or up has about a 90% chance of having the option but still is a crap shoot.


Pick a good aftermarket controller and you're good.


And don't quote me on this but I think if you remove the Ford controller you may have to get the computer reflashed to un-recognize it.

murf

From my experience, all 7 wires always go to the back. When your truck is equipped with the 4 pin only, you can follow the wiring back under the spare tire and find the orange, blue, and purple wires. Orange being constant power, blue being the brakes, and purple being reverse lights for trailers with them.

These wires end in a harness where it connects to the 4 pin harness. Should be as easy as going to the dealer and getting the 3 foot harness that connects the 7 wires to a 7 pin harness. If you wired it yourself, as I did with my old 2006, it will cost you a whopping $10.

Cheers

SpeedViktm

Nope. The wires are not there, period. That's what we've been talking about, in the main harness where the short cable plugs in above the spare only has 3 wires.

SpeedViktm

Maybe where it was made? I have a Kansas City truck. I know where it was made makes a difference on how the wires to the doors are. KC passes through a flex grommet, Detriot (??) uses Molex connectors. Lots of jabber about that in the audio forum.

murf

Dang....you think they could have shorted you the wires the whole way? How far up did you look?

EventHorizon

Mine's a Dearborn truck. Might be the reason.