Yamaha XV19SX(C) Service Manual page 477

2. Check:
• Stator coil resistance
Out of specification → Replace the stator coil.
Stator coil resistance
0.112–0.168 Ω
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a. Connect the pocket tester (Ω × 1) to the stator
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"
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1
b. Measure the stator coil resistance.
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EAS28170
CHECKING THE RECTIFIER/REGULATOR
1. Check:
• Charging voltage
Out of specification → Replace the rectifi-
er/regulator.
Charging voltage
14 V at 5000 r/min
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a. Set the engine tachometer to the cylinder-#1
left spark plug lead or right spark plug lead.
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2 3
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ELECTRICAL COMPONENTS
b. Connect the pocket tester (DC 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 →
black "2"
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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 HORNS
1. Check:
• Horn resistance
Out of specification → Replace.
Coil resistance
0.94–0.98 Ω
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a. Disconnect the horn 1 connectors and horn 2
coupler from the horn terminals.
b. Connect the pocket tester (Ω × 1) to the horn
terminals.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
horn terminal "1"
• Negative tester probe →
horn terminal "2"
7-86
R B
W
2
1
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LLL
MMM