Checking The Rectifier/Regulator; Checking The Fuel Sender - Yamaha Grizzly550 User Manual

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.
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EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Charging voltage
Out of specification → Replace the rectifi-
er/regulator.
Charging voltage
above 14 V at 5000 r/min
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a. Connect the engine tachometer to the spark
plug lead.
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
L LLL L L LLL L LLL
M MMM M M MMM M MMM
9-93
ELECTRICAL COMPONENTS
• 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
EAS28230

CHECKING THE FUEL SENDER

1. Disconnect:
• Fuel pump coupler
(from the wire harness)
2. Remove:
• Fuel pump assembly
(from the fuel tank)
3. Check:
• Fuel sender resistance
Out of specification → Replace the fuel pump
assembly.
Sender unit resistance (full)
19.00–21.00 Ω
Sender unit resistance (empty)
139.00–141.00 Ω
M MMM M MMM M M MMM M M MMM M
a. Connect the pocket tester (Ω × 10) to the fuel
sender terminal as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
green/yellow "1"
• Negative tester probe
black/white "2"
R B
2
1
L LLL L L LLL L LLL
M MMM M M MMM M MMM