My cousin is Missouri and the OD control went out again.
Need to know what wires to tie together to make the OD manual with the switch.

 

You need to ground the wire that's not blue. For a quick limp-it-home solution, use a scotchlock on the ground wire (orange with a light green stripe) and run the wire in the window to an alligator clip. Clip it to something grounded when you want OD.

It won't work with the dash switch because that just tells the computer that you have "requested" overdrive, it's not a real switch.

 

Thanks,
This is the third or fourth OD controller that this truck has gone through.
It went through 2 in about a year when I owned it and it has gone through 1 or 2 since he owned it.

What is burning these things up?
For $200 a pop, he needs an alternative.

 

What do you mean, the TPS keeps crapping out?

 

The TPS keeps going bad.
It will start randomly shifting in and out of OD regardless of speed or throttle position. Put a new TPS on it and it works fine.

Also, grounding the orange with brown stripe wire did nothing to help the problem.

Can we intercept the actual wire that goes into the transmission and put a switch on it?

What color wire is it?
What voltage does it take to activate the OD selenoid?
He is tired of fooling with the TPS and just wants to make OD manual.

 

Sure you can. Find the connector with 2 wires. Figure out which wire has +12v when the ignition is on, you don't want to connect to this one, it should be the larger diameter one, I don't remember what color it is. Splice into the other wire and run it into the cab and use a switch to switch it to ground. If you hook into the wrong wire and ground it you will be chasing down a blown fuse.

 

That's because you should have grounded the orange wire with the green stripe. It's on the connector that Mike posted about. I should have been more specific on where the wire was located.

 

Somebody say TPS? Check my sig for a cheap and effective fix.

 

You are talking about the connector that goes to the transmission?
He spliced into the orange wire with stripe that goes into the TPS.

 

Yes the wire that goes into the side of the transmission.