Willcox Corvette, Inc. - Corvette Repair & Install Help TSB ORIGINAL gm TECH; Vacuum Schematic Headlamp and Wiper; Vacuum Schematics-Heater and Air Cond; Vent and Air Flow; Weatherstrip Tech; Windshield Frame; Wiper; Wirinig Diagram; Recent Posts. Please donate to Willcox Corvette Parts Tech Service! The Purpose: To Help Offset Fee’s involved in running the tech site and keeping it free to everyone. TH400 rebuild tech Oct 23, 2016Kickdown wiring. In the diagram above (1969 Camaro), the power is taken at the wiper motor by using a piggyback terminal connector. The kickdown was originally switched either at the accelerator pedal or at the carb throttle linkage, depending on make. A microswitch can be used to trigger the kickdown, or a factory switch can be used.