Checking The Rectifier/Regulator; Checking The Horn - Yamaha XG250 Service Manual

Stator coil resistance
0.56–0.84 Ω
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect the pocket tester (Ω × 1) to the sta-
tor coil coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Positive tester probe
●
White "1"
Negative tester probe
●
White "2"
Positive tester probe
●
White "1"
Negative tester probe
●
White "3"
Positive tester probe
●
White "2"
Negative tester probe
●
White "3"
1 2
W W
W
3
b. Measure the stator coil resistance.
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EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
Rectifier/regulator output voltage
●
Out of specification → Replace the rectifier/
regulator.
Rectifier/regulator output voltage
14 V at 5000 r/min
ELECTRICAL COMPONENTS
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a. Set the engine tachometer to the ignition coil
of cylinder #1.
b. Connect the pocket tester (AC 20 V) to the
rectifier/regulator coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Positive tester probe
●
red "1"
Negative tester probe
●
ground "2"
W W
R W
1
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
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EAS28180

CHECKING THE HORN

1. Check:
Horn resistance
●
Out of specification → Replace.
Horn resistance
1.01–1.11 Ω at 20°C (68°F)
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a. Disconnect the horn leads from the horn ter-
minals.
b. Connect the pocket tester (Ω × 1) to the horn
terminals.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
7-45
2