Power Tailgate Windows: Description
General Motors uses only one type of power tailgate window on 1973-74 vehicles. This retractable type window is used exclusively on "B" body station wagons. Tailgate window retracts into space between roof and headliner. It can be operated by either the instrument panel switch, or external tailgate window control switch. An ignition relay prevents window operation from instrument panel switch without ignition switch being turned on. The window is controlled by a gearbox type regulator, 12 volt reversible motor with an internal circuit breaker, guide cams and rollers, drive cable, and lift spring. Motor and regulator assemblies are mounted to the rear of the spare tire well in right rear quarter. During window movement, the motor drives a cable, operating the window regulator gear. In turn, the regulator gear pulls a spiral cable connected to window guide cam. The spiral window cable is stored in conduit below regulator. Upward travel of window is assisted by a lift spring mounted in roof above headliner.