1997-1998 Polaris SLX-Pro 785 Service Manual Supplement, Page 67Get this manual
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ELECTRICAL Temperature Warning
Coolant Temperature Warning Circuit Operation
The MFD light is controlled by temperaturewarning switch installed into the engine cooling systemWhen engine coolant temperature sensor reaches its "ON" temperature the switch closes, completing the current flow from the wire harness through the warning buzzer and to groundThe system should be tested periodically for proper operation
Temperature Warning Circuit Test
1Remove wire from temperature sensing switch located on upper water manifold
Warning light in MFD is activated when temperature switch contacts are closed (overheat condition) and ground path is completeThe temperature sensor is located on the cylinder headwater nutlet manifoldGround the sensor wire from MFD with engine running to see if temp light activates
Temperature Sensor Test
The temperaturewarning switch is normally openUsing digital VOM set in the Ohms positionand with the wires disconnected, contact one test probe to the switch terminal and the other test probe to engine ground The meter should show an open circuitHeat the switch in water bath to the "on" temperature listed belowMeasure resistance of the switch Reading should be less than .4 ohms