Section 05
ELECTRICAL
Subsection 03
(CHARGING SYSTEM)
VMR2004_140_05_03A.FM
05-03-1
CHARGING SYSTEM
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TESTING PROCEDURE
NOTE:
First, ensure that battery is in good condi-
tion prior to performing the following test using a
current inductive ammeter such as Snap-on MT
110.
If the battery is regularly discharged, check main
fuse (20 amp) condition.
1. Main fuse
The voltage regulator/rectifier could be the culprit
of a blown fuse. To check, simply disconnect the
voltage regulator/rectifier from the circuit.
If the fuse still burns, check for a defective wire.
CAUTION:
Do not use a higher rated fuse as this
can cause severe damage.
Voltage Regulator/Rectifier
STATIC TEST: CONTINUITY
1. Due to internal circuitry, there is no static test
available.
DYNAMIC TEST
Current Test
Proceed as follows:
– Start engine.
– Lay an inductive ammeter on positive cable of
battery.
– Bring engine to approximately 3500 RPM.
Depending on battery charge, current reading
should be approximately
5 amperes
. If not, check
magneto output prior to concluding that voltage
regulator/rectifier is faulty.
Voltage Test
Proceed as follows:
– Start engine.
– Connect a multimeter to battery posts. Set mul-
timeter to Vdc scale.
– Bring engine to approximately 3500 RPM.
If multimeter reads over 15.1 ± 0.5 volts, voltage
regulator/rectifier is defective. Replace it.
NOTE:
Whatever the voltmeter type used (peak
voltage or RMS), the voltage must not exceed
15 V. A faulty voltage regulator/rectifier will allow
voltage to exceed 15 V as engine speed is in-
creased.
NOTE:
If the battery will not stay charged, the
problem can be any of the charging circuit compo-
nents. If these all check good, you would be accu-
rate in assuming the problem to be in the voltage
regulator/rectifier.
If there is no charging at the battery with the pre-
ceding voltage test, the following test can also be
performed.
NOTE:
If the voltage regulator/rectifier is within
the specification, the wiring harness between the
voltage regulator/rectifier and battery is defective.
If the voltage regulator/rectifier is out of specifica-
tion and the stator tests good, the voltage regulator/
rectifier is defective.
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V07G02B