Charging System Stator (Alternator) Tests; Stator Replacement - Polaris RANGER XP 900 2018-2019 Service Manual

CHARGING SYSTEM STATOR (ALTERNATOR) TESTS

Three tests can be performed using a multi-meter to
determine the condition of the stator (alternator).
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: 0.1 Ω +/- 20%
CONNECT
TEST METER
LEADS TO:
Battery Charge
Y1 to Y2
Coil
Battery Charge
Y1 to Y3
Coil
Battery Charge
Y2 to Y3
Coil
NOTICE
If there are any significant variations in ohm readings
between the three legs it is an indication that one of the
stator legs may be weak or failed.
TEST 2: Resistance Value of Each Stator Leg to
Ground
2. Measure the resistance value of each of the stator
legs to ground: Y1 to Ground, Y2 to Ground, Y3 to
Ground.
9929399 R01 - 2018-2019 RANGER XP/ CREW 900/1000 Service Manual
© Copyright Polaris Industries Inc.
3. Each test should measure: Open Line (OL / ∞)
TEST
Battery Charge
Coil
Any measurement other than Infinity (open) will indicate
TEST 3: Measure AC Voltage Output of Each
Stator Leg at Charging RPM
4. Set the selector dial to measure AC Voltage.
5. Start the engine and let it idle.
6. 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).
OHMS
READING
7. Refer to the following table for approximate AC
Voltage readings according to RPM. Test each leg at
the specified RPM in the table.
0.1 Ω +/- 20%
8. Example: The alternator current output reading
0.1 Ω +/- 20%
should be approximately 21 VAC ± 25% at 1300
RPM between each 'leg'.
0.1 Ω +/- 20%
If one or more of the stator leg output AC voltage varies
significantly from the specified value, the stator may
RPM READING
1300
3000
5000

STATOR REPLACEMENT

Refer to "Stator Cover Removal / Inspection"page
3.45 procedure to service the stator.
The stator cover can be removed with the engine
Be sure to thoroughly clean the area around the stator
ELECTRICAL
CONNECT
OHMS
METER
READING
LEADS TO:
Open Line
Y1, Y2, or Y3
(OL / ∞)
to Ground
NOTICE
a failed or shorted stator leg.
NOTICE
need to be replaced.
AC VOLTAGE (VAC)
READING
21 VAC ± 25%
47 VAC ± 25%
79 VAC ± 25%
NOTICE
installed in the chassis.
cover prior to removal.
11
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