Sym DD 50, Service Manual

Page: 145 / 157

15. ELECTRICAL EQUIPMENT
15-8
Voltage Regulator Inspection
Check the each pins of connector on the voltage
regulator.
Inspection Probable cause
Check voltage between battery terminal (red) and ground
(green). Blown fuse or poor main switch
contact
Check continuity between ground and frame. Open-circuit wire
Check charging coil (white to ground) if its resistance is
within 0.2~1.0
Ω
Check charging /illumination coil (yellow to ground) if its
resistance is within 0.2~0.8
Ω
Open-circuit in alternator charging
coil or in illumination switch.
If wire circuit check is in normal and there is no
loose in the pins of voltage regulator connector,
then measure the resistance among pins on the
connectors of voltage regulator.
Voltage Regulator
Multi-meter(+)
Multi-meter (-)
White
A
Yellow
L
Red
B
Green
E
White A
∞
4~7
Yellow B
∞ ∞
2.4~4.8
Red B 4~7
∞ ∞
Green E
∞
2.4~4.8
∞
If the resistance values are abnormal among the
pins, replace the voltage regulator.
Caution
y
If the probe is touched by finger, then the
resistance values will be incorrect.
y It contains semi-conductor in circuit so the
measured resistance value will be in
different if different testers are used. Thus,
these values cannot be judged with
standards.
AC Generator Inspection
Remove body cover.
Disconnect the generator harness connector.
Measure the resistance on both charging coil (the
white to ground) and illumination coil (the yellow
to ground).
Resistance Measurement: (20
℃
)
Charging coil (white - green): 0.2~1.0
Ω
Illumination coil (yellow - green): 0.1~0.8
Ω
Voltage regulator
Voltage regulator
connector
Red (B)
White (A)
Yellow (L)
Green (E)
AC. Generator
harness connector
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