Checking The Stator Coil; Checking The Rectifier/Regulator; Checking The Horn - Yamaha Vmax VMX17C 2009 Service Manual

EAS28150

CHECKING THE STATOR COIL

1. Disconnect:
• Stator coil coupler
(from the wire harness)
2. Check:
• Stator coil resistance
Out of specification → Replace the stator coil.
Stator coil resistance
0.184–0.276 Ω at 20 °C (68 °F)
M MMM M MMM M M MMM M M MMM M
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"
W W W
1 2 3
b. Measure the stator coil resistance.
L LLL L LLL L L LLL L L LLL L
EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Charging voltage
Out of specification → Replace the rectifi-
er/regulator.
M MMM M M MMM M MMM
L LLL L L LLL L LLL
8-134
ELECTRICAL COMPONENTS
Charging voltage
14 V at 5000 r/min
M MMM M MMM M M MMM M M MMM M
a. Set the engine tachometer to the spark plug
lead of cylinder #1.
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"
W W W
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
L LLL L LLL L L LLL L L LLL L
EAS28180

CHECKING THE HORN

1. Check:
• Horn sound
Faulty sound → Adjust or replace.
M MMM M MMM M M MMM M M MMM M
a. Connect a battery (12 V) to the horn.
b. Turn the adjusting screw in direction "a" or "b"
until the horn sound is obtained.
a
L LLL L LLL L L LLL L L LLL L
M MMM M M MMM M MMM
R B
2
1
L LLL L L LLL L LLL
M MMM M M MMM M MMM
b
L LLL L L LLL L LLL