[cfree3]

We checked the voltage going through the override switch and it is not 12 volts when the switch is closed. Is it supposed to be 12 volts or over? The wires from the switch go into a 12 volt relay. The HWH book says that the override switch is wired to wire #155 on the transmission ECV. I talked to an Allison transmission mechanic and he said wire #155 is in the gray connector going into the TCM or ECU or ESM (whatever it is called for the transmission). Does anyone know where Newell may have mounted the TCM?
The wire is used as a General Purpose Input.

Any help would be appreciated.