11
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
11.35
CHARGING SYSTEM “BREAK EVEN” TEST
CAUTION
Do not allow the battery cables to become
disconnected with the engine running. Follow the steps
below as outlined to reduce the chance of damage to
electrical components.
The “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 battery. Depending
on battery condition and system load, the break even
point may vary slightly. The battery should be fully
charged before performing this test.
WARNING
Never start the engine with an ammeter connected in
series. Damage to the meter or meter fuse will result.
Do not run test for extended period of time. Do not run
test with high amperage accessories.
1. Using an inductive amperage metering device, (set
to DC amps) connect to the negative battery cable.
2. With engine off, key switch in the on/lights off
position, the ammeter should read negative amps
(battery discharge).
3. Shift transmission into park and start the engine.
With the engine running at idle, observe meter
readings.
4. Increase engine RPM while observing ammeter and
tachometer. Note the RPM at which the battery starts
to charge (ammeter indication is positive).
5. With lights and other electrical loads off, the “break
even” point should occur at idle.
6. With the engine running, turn the lights on and
depress the brake pedal to keep brake lights on.
7. Repeat test, observing ammeter and tachometer.
With lights on, charging should occur at or below
1,500 RPM.
CHARGING SYSTEM 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:
TEST
CONNECT
METER
LEADS TO:
OHMS
READING
Battery Charge
Coil
Y1 to Y2
Less than 1Ω
Battery Charge
Coil
Y1 to Y3
Less than 1Ω
Battery Charge
Coil
Y2 to Y3 Less than 1Ω
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. The resistance of the
meter leads must be subtracted from the reading. Use a
milli-ohm meter for best results.
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.
ELECTRICAL
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