Charging System Alternator Tests - Polaris Ranger 500 2x4 2007 Service Manual

ELECTRICAL

Charging System Alternator Tests

Three tests can be performed using a multimeter to determine
the condition of the stator (alternator).
Carb Model
EFI Model
Y1
Y3
Y2
TEST 1: Resistance Value of Each Stator Leg
1. Measure the resistance value of each of the three stator
legs: Y1 to Y2, Y1 to Y3, and Y2 to Y3.
Each test should measure: 0.43Ω ± 20%
Connect Meter
Test
Leads To:
Battery Charge Coil
Battery Charge Coil
Battery Charge Coil
NOTE: If there are any significant variations in
ohm's readings between the three legs; it is an
indication that one of the three stator legs maybe
weak or failed.
10.30
Y1 Y2
Ohms Reading
Y1 to Y2 0.43Ω ± 20%
Y1 to Y3 0.43Ω ± 20%
Y2 to Y3 0.43Ω ± 20%
TEST 2: Resistance Value of Each Stator Leg to Ground
1. Measure the resistance value of each of the stator legs to
ground: Y1 to Ground, Y2 to Ground, Y3 to Ground.
Each test should measure: Open Line (OL)
Test
Battery Charge Coil
NOTE: Any measurement other than Infinity (open)
will indicate a failed or shorted stator leg.
TEST 3: Measure AC Voltage Output of Each Stator Leg at
Charging RPM
1. Set the selector dial to measure AC Voltage.
Y3
2. Start the engine and let it idle.
3. While holding the engine at a specified RPM, separately
measure the voltage across 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).
4. Refer to the following table for approximate AC Voltage
readings according to RPM. Test each leg at the specified
RPM in the table.
Example: The alternator current output reading should be
approximately 18 VAC at 1300 RPM between each 'leg'.
NOTE: If one or more of the stator leg output AC
voltage varies significantly from the specified value,
the stator may need to be replaced.
RPM Reading
1300
3000
5000
Connect Meter
Ohms Reading
Leads To:
Y1, Y2, or Y3 Open Line
to Ground (Infinity)
AC Voltage (VAC) Reading
18 VAC ± 25 %
42 VAC ± 25 %
64 VAC ± 25 %