Weichai America Corp.
105
Figure 11-3 Diagnosis Trouble Flow Chart for Alternator
2)
Failure diagnosis & troubleshooting method of charging system
a)
It is not charging
Failure 1: It is not charging
Vehicle fault
Fault testing
Troubleshooting
(1) Charging
indicator does not
go out when the
a. Test for voltage
of alternator
excitation terminal
a. If the terminal voltage of alternator indicator lamp is too
low, it indicates that the power of excitation circuit indicator is
too small or there is poor connection of circuit. Adjust the
power of indicator lamp or test circuit connector and
Turn on the power switch of the vehicle, and connect the test
lamp to the terminal B+ and E (negative pole) of the
alternator
Is the test lamp ON?
Connect the wire from terminal E to
terminal D+ of the alternator
Is the test lamp light
ON?
Start the engine
Is the test lamp light
ON?
The alternator is
trouble free
Alternator malfunction
It indicates that the internal electric circuit of wiring
terminal D+ of the alternator is malfunctioning
It indicates that there is no voltage at wiring
terminal B+ of alternator and the wire to the positive
pole of battery is malfunctioning
Yes
No
Yes
No
No
Yes
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