Stator / Alternator Tests - Polaris Sportsman 850 Service Manual

ELECTRICAL

STATOR / ALTERNATOR TESTS

Three tests can be performed using a multimeter 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.
STATOR RESISTANCE VALUES
CONNECT METER
TEST
LEADS TO:
Charge Coil Y1 to Y2 (Pin B to C) 0.13 Ω ± 15%
Charge Coil Y1 to Y3 (Pin A to C) 0.13 Ω ± 15%
Charge Coil Y2 to Y3 (Pin A to B) 0.13 Ω ± 15%
If there are any significant variations in ohm readings
between the three legs, one of the three stator legs may
be weak or failed.
TEST 2: Resistance Value of Each Stator Leg to
Ground
11.68
OHMS
READING
NOTE
2. Measure the resistance value of each of the stator
legs to ground.
CONNECT
TEST METER LEADS
TO:
Battery Charge Y1, Y2, or Y3
to Ground
Coil
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
3. Set your multimeter meter to measure AC Voltage.
4. Disconnect the 3-wire stator connector near the
stator housing.
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 stator (Y1 to Y2, Y1 to Y3, Y2 to
Y3).
7. Refer to the following table for approximate AC
Voltage readings according to RPM. Test each leg at
the specified RPM in the table.
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
AC VOLTAGE READING
READING
115 Vac ± 10 % (Nominal)
6000
171 Vac ± 10 % (Peak)
OHMS
READING
Open Line
(Infinity)
NOTE
NOTE