Yamaha XT250X 2008, Service Manual, Page: 270 / 282

ELECTRICAL COMPONENTS
7-45
b. Measure the stator coil resistance.
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EAS28170
CHECKING THE RECTIFIER/REGULATOR
1. Check:
●
Rectifier/regulator input voltage
Out of specification
→
Replace the rectifier/
regulator.
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a. Connect a digital tachometer to the spark
plug lead of the cylinder.
b. Connect the pocket tester (DC 20 V) to the
rectifier/regulator coupler as shown.
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the rectifier/regulator input voltage.
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EAS28180
CHECKING THE HORN
1. Check:
●
Horn resistance
Out of specification
→
Replace.
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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.
c. Measure the horn resistance.
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2. Check:
●
Horn sound
Faulty sound
→
Adjust or replace.
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a. Connect a battery (12 V) to the horn.
b. Turn the adjusting screw in direction “a” or “b”
until the specified horn sound is obtained.
Rectifier/regulator input voltage
above 14 V at 5000 r/min
Pocket tester
90890-03132
Positive tester probe
Red “1”
Negative tester probe
Ground to chassis frame
3
1
2
1
Horn resistance
1.01
–
1.11
Ω
at 20
°
C (68
°
F)
Pocket tester
90890-03132
Positive tester probe
Horn terminal “1”
Negative tester probe
Horn terminal “2”
1
2
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