2010 Polaris Sportsman 850 Service Manual, Page 338Get this manual
ELECTRICAL CHARGING SYSTEM
Charging System Diagram
The charging system consists of: Battery StatorAlternator Voltage RectifierRegulator
Battery Charge Test CAUTION
Do not allow the battery cables to become disconnected with the engine runningFollow the steps below as outlined to reduce the chance of damage to electrical components12345Verify the battery is fully charged and in good conditionWith the engine running, connect the multimeter to the positive and negative battery terminalsTest for Vdc with the multimeterThe meter display should read approximately 14.014.4 Vdc at idleIf the voltage is lower than 14.014.4 Vdc, the alternator should be tested
Voltage RectifierRegulator (600 Watt)
The voltage rectifierregulator is responsible for converting AC voltage to DC voltage and controls the DC outputNOTE: If the temperature of the regulatorrectifier exceeds 194 (90C), the unit will turn itself off to cool downThe unit will turn on at approximately 167F (75C)If voltage output is equal to or less than static battery voltage, verify the housing cooling fins are clean, free from debris and that adequate airflow is present