10.25
ELECTRICAL
10
NOTE: 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
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)
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.
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.
Regulator / Rectifier
The Regulator / Rectifier is located behind the radiator cooling
fan and can be accessed through the front left wheel well.
NOTE: If the regulator / rectifier overheats, the unit
will turn itself off to cool down. The unit will turn on
again after it has cooled down. If it turns off, verify
the cooling fins are clean, free from debris and that
adequate airflow is present.
Test
Connect Meter
Leads To:
Ohms Reading
Battery Charge Coil
Y1, Y2, or Y3
to Ground
Open Line
(Infinity)
RPM Reading AC Voltage (VAC) Reading
1300 18 VAC ± 25 %
3000 42 VAC ± 25 %
5000 64 VAC ± 25 %
Regulator / Rectifier
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