Yamaha MTN1000 2016 Service Manual page 620

on page 8-202.
Rectifier/regulator input voltage
above 14 V at 5000 r/min
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a. 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
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"
b. Start the engine and let it run at approximate-
ly 5000 r/min.
c. Measure the rectifier/regulator input voltage.
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2. Check:
• Rectifier/regulator output voltage
Out of specification  Replace the rectifi-
er/regulator.
Regulated voltage (DC)
14.3–14.7 V
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a. Connect the pocket tester (DC 20 V) to the
battery as shown.
1 2 3
W W W
8-203
ELECTRICAL COMPONENTS
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
positive battery terminal "1"
• Negative tester probe
negative battery terminal "2"
1
b. Start the engine and let it run at approximate-
ly 5000 r/min.
c. Measure the charging voltage.
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EAS30569
CHECKING THE HORN
1. Check:
• Horn sound
Faulty sound  Replace.
EAS30573
CHECKING THE FUEL SENDER
1. Disconnect:
• Fuel pump coupler
(from the fuel pump)
2. Remove:
• Fuel tank
3. Remove:
• Fuel pump
(from the fuel tank)
4. Check:
• Fuel sender resistance
Out of specification  Replace the fuel pump
assembly.
Sender unit resistance (full)
9.0–11.0 
Sender unit resistance (empty)
213.0–219.0 
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a. Connect the pocket tester (  10/100) to the
fuel sender terminals as shown.
2