Checking The Rectifier/Regulator; Checking The Thermo Switch - Yamaha 2009 YFM25RY Service Manual

EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Rectifier/regulator output voltage
Out of specification → Replace the recti-
fier/regulator.
Rectifier/regulator output volt-
age
14 V at 5000 r/min
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Set the engine tachometer to the ignition
coil.
b. Connect the pocket tester (AC 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"
c. Start the engine and let it run at approxi-
mately 5000 r/min.
d. Measure the rectifier/regulator input volt-
age.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS4D3F002

CHECKING THE THERMO SWITCH

1. Remove:
• Thermo switch
(from the wire harness)
2. Check:
• Thermo switch continuity
Out of specification → Replace the
thermo switch.
ELECTRICAL COMPONENTS
• Positive tester probe
Black "1"
• Negative tester probe
Black "2"
Test step Coolant temperature Continuity
Less than 16±3 °C
1
(60.8±5.4 °F)
More than 16±3 °C
2
(60.8±5.4 °F)
More than 11±3 °C
3
(51.8±5.4 °F)
Less than 11±3 °C
4
(51.8±5.4 °F)
Step 1 and 2: Heating phase
Step 3 and 4: Cooling phase
A. Heating phase
B. Cooling phase
3. Install
• Thermo switch
7-41
YES
NO
NO
YES