2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 349Get this manual
ELECTRICAL
CHARGING SYSTEM TESTING
Whenever charging system problems are suspected, proceed with the following system check
Using multitester set on D.Cvolts, measure the battery open circuit voltage (See page 10.12)It 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