2009 Polaris Outlaw 450/525 Service Manual, Page 172Get this manual
ELECTRICAL Alternator Tests (Charging System)
Three tests can be performed using multimeter to determine the condition of the stator (alternator)TEST 1: Resistance Value of Each Stator Leg 1Measure the resistance value of each of the three stator legs: Y1 to Y2, Y1 to Y3, and Y2 to Y3Each should measure 0.46 ohmsNOTE: If there are any significant variations in ohms readings between the three legs; it is an indication that one of the three stator legs may be weak or failedTEST 2: Resistance Value of Stator Leg to Ground 1Measure the resistance value of each of the stator legs to ground: Y1 to Ground, Y2 to Ground, Y3 to GroundNOTE: Any measurement other than Infinity (open) will indicate failed or shorted stator legTEST 3: Measure AC Voltage Output of Each Stator Leg at Charging RPM with Voltmeter set to Volts AC1234Set the voltmeter to read AC VoltagePlace transmission in neutralStart the engine and let it idleSeparately test each 'leg' of the stator by connecting the meter leads to the wires leading from the alternator (Y1 to Y2, Y1 to Y3, Y2 to Y3)Slowly apply the throttle to increase engine speed above 2000 RPMAlternator Output Readings should be no less than 30-40V AC on each 'leg'