Alternator - Yanmar 4JH2E Service Manual

Chapter 9 Electrical System
~4:..
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4JH Series
4-11 Troubleshooting
(1) Charging failure
'/ Does the charge lamp go oft '
1
\
( when the key switch is turned I/
-0..
(af.:er engine starting)?
~
Goes off
Doesn't Defective
go off
Check fan belt
OK
After stopping the engine, turn on the key switch.
Remove R·L generator coupler.
Defective
Measure the voltage between BAT
terminal, and R·L coupler terminal.
OK
BAT, A·L terminal
Voltage: 9-12V
'
Insert R-L coupler to generator .
•
Turn on the key switch for engine starting.
Defective
• Measure the voltage between
' " Measuring condition
generator BAT, and L terminal.
Generator rpms: 5,000
Refer to page 99.
OK
Defective
Light the night lamp. Measure
the BAT terminal voltage of
generator; 0.3-2V is normal.
9.34
o Replace fan belt.
oAdjust fan belt.
a Check electrical wiring for defective
continuity of the BAT, and R
terminals.
o Check the key switch and charge
lamp for defective continuity of the
L-terminat.
o In case of defective continuity of
BAT terminal, replace IC regulator.
o In case of defective continuity of
L-terminal, check or replace diode,
starter, and rotor.
Check electrical wiring for night
tamp.
Printed in Japan
AOA1029-9002