My cruise control quit totally. I have functioning brake lights and the pedal cut-off switch is properly adjusted. The system holds vacuum fine all the way to the throttle plate without loss. It was suggested to me the switch might be bad on the column and I have a good parts car, so I changed the turn signal/cruise control switch, as well as the control unit on the left shock tower under the hood.
No change, still fails to engage or do anything. What next?? Most appreciative for any help folks.