Solenoid Control Switch

Switch opens or closes in relation to transmission gear position (vehicle speed on automatic transmission models). In high gear (manual transmission) or vehicle speed over 34-38 MPH (automatic transmission), switch opens and breaks ground circuit to the solenoid vacuum valve.

In low gear ranges (manual transmissions), or vehicle speed less than 22-28 MPH (automatic transmission), switch is closed and completes the ground circuit to solenoid vacuum valve. Switch is operated by shifter shaft of manual transmission models, and by speed sensor mounted in the speedometer cable on automatic transmission models.