AL4D torque converter not locking up

[tuckman]

I had my wiring harness touching the exhaust manifold and some bare wires were showing. Then the ex would not start, tried many different things and it came down to the neutral start switch. I think it is done for, causing the ex to not let the starter kick in when i turn the key to start. So I wired in a push button across the starter solenoid, put the key in run and then hit the button and she stars right up! Before the problem the torque converter locked up perfectly every time.

So my question.

What wires are responsible for the torque converter lock up in 3rd and overdrive? Is it possible that when re-wiring the harness from a 93 to my current 92 there is a cross up somewhere? Or did I fry one of the solenoids in the valve body?

It has been a long time since I have been here so I cannot remember where everything is anymore.

 

[BrooklynBay]

On the 3 wire connector, There is only one positive. The PCm supplies the ground signal for the TCC on one wire, and another ground signal for the 3-4 shift (overdrive). Either the wiring harness or the PCM suffered some damage from the short. Since the exhaust is grounded, it might not be an issue with the PCM.

 

[tuckman]

I am guessing that I will have to re-trace my steps in the harness swap as there was one or two splices that needed to be made and there is an extra connector not being used as it was in a different place on the 92 and is connected to the charcoal canister (I think).
If the harness wasn't connected correctly, I would not get the 3-4 shift? (does that question make sense?)

 

[BrooklynBay]

Yes, but only providing that the connector is unplugged or if there is no (+) 12 V in the middle of the plug.

 

[Yankee516]

If you've ruled out wiring, the next step would be to drop the pan and test the operation of the solenoids from inside the car. You should hear each open and close as 12V are applied to them.

 

[tuckman]

The + signal (solid red wire) in this part of the Ex goes to the TC lockup/3-4 shift and the charcoal canister. Seeing that I am getting the 3-4 shift the + is fine, right? I will trace the - for the TC lockup to make sure it is going where it should in the harness, just to be sure before pulling the pan.