Checking The Rectifier/Regulator; Checking The Horn - Yamaha XT250X Service Manual

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b. Measure the stator coil resistance.
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EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
Rectifier/regulator input voltage
G
Out of specification → Replace the rectifier/
regulator.
Rectifier/regulator input voltage
above 14 V at 5000 r/min
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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.
Pocket tester
90890-03132
Positive tester probe
Red "1"
Negative tester probe
Ground to chassis frame
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the rectifier/regulator input voltage.
ELECTRICAL COMPONENTS
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EAS28180

CHECKING THE HORN

1. Check:
Horn resistance
G
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.
Positive tester probe
Horn terminal "1"
Negative tester probe
Horn terminal "2"
c. Measure the horn resistance.
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2. Check:
Horn sound
G
Faulty sound → Adjust or replace.
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a. Connect a battery (12 V) to the horn.
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b. Turn the adjusting screw in direction "a" or "b"
until the specified horn sound is obtained.
7-45
Horn resistance
1.01–1.11 Ω at 20°C (68°F)
Pocket tester
90890-03132
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