2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 237Get this manual
ELECTRICAL
CHARGING SYSTEM TESTING
Whenever charging system problems are suspected, proceed with the following system checkUsing multitester set on D.Cvolts, measure the battery open circuit voltageIt should be 12.4 volts or moreIs it? Yes
Meter Setting: DC Volts
Remove the battery and properly serviceReinstall the fully charged battery or fully charged shop battery
With the transmission in neutral, start the engine and increase RPM to between 3000 and 4000Read battery voltage with the multitesterReadings should increase to between 13.0 and 14.6 D.CAre they? No
Meter Setting: DC Amps
Check Key off Current Draw
Perform system "Break Even Amperage" test outlined on Page 10.22Does charging occur as specified? No Ohm stator wires (Y) If bad replace, if good, continue with alternator output testMeter Setting: AC Amps