Yamaha 2012 Grizzly 300 Service Manual page 285

EBS01066
3. Charging voltage
• Connect the engine tachometer to the
spark plug lead.
• Connect the pocket tester (DC 20 V) to the
battery as shown.
Positive tester probe
positive battery terminal
Negative tester probe
negative battery terminal
• Start the engine and let it run at approxi-
mately 5,000 r/min.
• Measure the charging voltage.
Charging voltage
14 V at 5,000 r/min
TIP
Make sure the battery is fully charged.
• Is the charging voltage within specifica-
tion?
NO
→
→
DC20V
YES
The charging circuit
is OK.
CHARGING SYSTEM
EBS01100
4. Charging coil resistance
• Disconnect the C.D.I. magneto coupler
from the wire harness.
• Connect the pocket tester (Ω×1) to the
charging coils.
Positive tester probe
Negative tester probe
Positive tester probe
Negative tester probe
1
Y Y
Y
2
• Measure the charging coil resistance.
Charging coil resistance
0.20 ~ 0.40 Ω at 20 °C (68 °F)
(between yellow and yellow)
YES
Replace the rectifier/
regulator.
5.Wiring
• Check the entire charging system's wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the charging system's wiring properly
connected and without defects?
YES
Replace the rectifier/
regulator.
9-18
ELEC
– +
→
yellow terminal
→
yellow terminal
2
→ yellow terminal
→
yellow terminal
3
Ω×1
3
NO
Replace the pickup
coil/stator assembly.
NO
Replace the diode
and properly con-
nect or repair the
charging system's
wiring.