2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 226Get this manual
ELECTRICAL
FAN MOTOR CURRENT DRAW
A current draw test provides good indication of fan motor conditionWorn or damaged fan motors will draw more current, which causes reduction in blade speed and reduced coolingConnect ammeter between OrBlk leads Brn OrBlk OrBlk Fan Motor
TEMPERATURE SENSOR (THERMISTOR) OPERATIONTEST
The thermistor relays power signal to the ECM depending on engine coolant temperatureShould the thermistor fail open the engine Hot light and fan will both come onWith engine cold, disconnect lead and measure resistance of sensor between the two YellowBlack connector terminalsThere should be no continuity from the thermistor lead to engine groundSee "Engine Temperature Controller" on Page 10.4 for additional information on thermistor operation
Fan Motor Harness
Ammeter
1Disconnect the harness from the thermistor2Connect DC ammeter in between the fan switch harness wires as shown3Be sure fan blade is free to rotate4Turn ignition key and engine stop switch to "ON" positionRead the current draw on ammeter with fan running5If the fan motor draws more than 7.5 Amps, continuous, replace the motorFan Motor Current Draw: Less Than 7.5 Amps