2000 Polaris Indy 500 / 600 snowmobile service manual, Page 400Get this manual
ELECTRICAL Coolant High Temperature Indicator Testing Circuit Power In Ground the BlackWhite wire (with the engine running) to test the light
Yel Temp
Engine Ground
The indicator light is controlled by temperaturewarning switch installed into the engine cooling systemWhen engine coolant temperature reaches approximately 205 F, the switch closes, completing the circuit through the indicator light to groundThe system should be tested periodically for proper operation