Re: Torque Converter lockup
Well, it's usually the vacuum switch in my experience that fails. I'd unhook your detent cable and then eliminate the vacuum switch and hook up a temporary toggle switch so you can control it.
I don't have a wiring schematic but if I had to guess by what your pictorial diagram shows that you'd need all the wires to be hot. That connector in your lower left might be for a temperature sensor to stop the torque converter from locking up when the motor is cold. I, myself, eliminated mine but I think mine worked off vacuum anyway. I'll look at it after my final exam tonight.