Originally Posted by gsoleski
The solenoid is 2 wire and I think the pressure switch was also 2 pin. I tried my set up in the picture with no luck. Should I ground B on the chassis if that is for the 4th gear switch?
Pin-A = +12V to the L/U solenoid.
Pin-B = 4th gear switch feeds the computer Ground when the Trans is in 4th gear.
Pin-C = 3rd Pr
. Switch or (Not used)
Pin-D = The computer feeds -Ground to activate the L/U.
It should be Pin-D for the TCC -Ground, Pin-B sends a -Ground signal to ECM indicating 4th gear.
You can give it/Pin-B a try because I can't see how it's wired inside
If that doesn't work something is bad inside, Solenoid or 4th Pr