Yanmar 3JH3E - 5-11 Troubleshooting

Chapter 9 Electrical System
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5-11 Troubleshooting
(1) Charging failure
Doesn't
go off
r-----------------, Defective --------------,
Does the charge lamp go off
when the key switch
is turned
(after engine starting)?
Goes off
*Measuring condition
Generator rpms: 5,000
Check fan belt
OK
After stopping the engine, tum on the key switch.
Remove the
R-L generator coupler.
----------------, Defective
Measure the voltage between the
BAT termirnal, and the
R-L
coupler terminal.
BAT, R-L terminal
Voltage: 9-12V
OK
Insert the R-l coupler to the generator.
Turn
on the key switch for engine startiny
*Measure the voltage between
the genArator BAT, and the
l
terminal.
OK
Light the night lamp. Measure
the BAT terminal voltage of
generator:
0.3-2V is normal.
9-38
Defective
Defective
• Replace fan belt.
• Adjust fan belt.
• Check electrical wiring for defective
continuity of the BAT, and R
terminals.
• Check the key switch and charge
lamp for defective continuity of the
l-terminal.
•
In case of detective continuity J'
BAT terminal, replace the IC n,\}U-
lator.
•
In case of defective continuity of
the L-terminal, check
or replace
the diode, sta rto r and rotor.
Check the electrical wiring for the
night lamp.
Printed in Japan
HINSHI-H8009