Yanmar 4LHA-HTP Operation Manual page 659

Chapter 9 Electrical System
4. Altemator
4-12 Troubleshooting
(1) Charging failure
Does the charge lamp go off
when the key switch is turned
[er engine starting)?
Goes off
' Measuring condition
Generator rpms: 5,000
Refer to page 99.
Doesn't
gooff
Check fan belt
OK
After stopping the engine, tum on the key switch.
Remove R-L generator coupler.
/ Measure the voltage between BAT
\ terminal, and R-L coupler terminal.
OK
BAT, R-L terminal
Voltage: 9—12V
Insert R-L coupler to generator.
Tum on the key switch for engine starting.
' Measure the voltage between
generator BAT, and L terminal.
OK
Light the night lamp. Measure
the BAT terminal voltage of
generator; 03—2V is nonnal.
9-33
Defective
o Replace fan belt,
o Adjust fan belt.
o Check electrical wiring for defective
Defective
continuity of the BAT, and R
terminals,
o Check the key switch and charge
lamp for defective continuity of the
L-tenminal.
o In case of defective continuity of
Defective
BAT terminal, replace IC regulator.
oln case of defective continuity of
L-terminal, check or replace diode,
startor, and rotor.
4LHA Serie