2000 Polaris Indy 500 / 600 snowmobile service manual, Page 401Get this manual
ELECTRICAL Speed Control Assurance Operation Auxiliary Kill Switch Contacts Off Idle Switch Insulator
Ignition Primary Conductor Idle Switch Engine Ground Plungers Outward
Throttle Control Cutaway
The speed control assurance consists of two series connected switchesIf one or both switch plungers are positioned inward, the circuit is open and the engine will runAt idle, with the throttle lever properly adjusted, the bottom switch circuit is open and the plunger is inwardThe top switch circuit is closed, and the plunger is outwardThe speed control circuit is open, allowing the engine to runAs the throttle lever is actuated to an off idle position, the top switch circuit is opened (plunger in) and the bottom switch circuit is closed (plunger out)The speed control circuit is still open, allowing the engine to runIn the event the carburetor or controls malfunction and allow the throttle cable to become slack, the circuit will close (both switch plungers out), grounding the ignition system and causing the engine to stop