2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 389Get this manual
ELECTRICAL Break Even Test CAUTION
Do not connect or disconnect the battery cable or ammeter with the engine runningDamage will occur to electrical componentsThe "break even" point of the charging system is the point at which the alternator overcomes all system loads (lights, etc and begins to charge the batteryDepending on battery condition and system load, the break even point may vary slightlyThe battery should be fully charged before performing this test
Alternator Output Test
Three tests can be performed using multimeter to determine the condition of the stator (alternator)
WARNING