Actually you are right as the 86 models and some other years do have one wire to the solenoid and its a 12 volt wire. The PCM is controlling the relay coil winding ground which in turn send 12 volts to the solenoid. Sorry as I am used to the PCM controlling the ground and forgot its the relay (trans lock-up or also called Part throttle un-lock relay) ground that the PCM controlls. Ron

Last edited by 383man; 04/16/15 10:40 AM.