Charging System "Break Even" Test; Charging System Stator (Alternator) Tests - Polaris 2015 RZR 900 Service Manual

ELECTRICAL

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 and lights in the on
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 approximately 1500 RPM
or lower.
11.16

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: 0.07 - 0.13 Ω
TEST
Battery Charge
Coil
Battery Charge
Coil
Battery Charge
Coil
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
2. Measure the resistance value of each of the stator
legs to ground: Y1 to Ground, Y2 to Ground, Y3 to
Ground.
9925723 R01 - 2015 RZR 900 Service Manual
© Copyright 2014 Polaris Industries Inc.
CONNECT
OHMS
METER
READING
LEADS TO:
Y1 to Y2 0.07 - 0.13 Ω
Y1 to Y3 0.07 - 0.13 Ω
Y2 to Y3 0.07 - 0.13 Ω