Weichai America Corp.
87
firmly, and whether it
is oxidized, virtual
connected and
overheated.
Notice: Check if the reinstalled or re-tightened parts are still very hot
after engine runs with heavy load for (3~5) min.
g. Test the phase
output voltage of
alternator (which
should be about half
of the output voltage
at B+).
When the phase output voltage (W/R/AC) is greatly different from
normal output voltage valve, alternator rectifier bridge or stator has
failed, and reconditioning or replacement should be considered.
h. Inspect battery for
normal charging.
After charging for 10 min, the charging current should drop to about10A,
and if the charging current reaches (30~90) A for a long period of time,
the battery is damaged and requires to be repaired or replaced.
c) Charging voltage too high
Failure3: High charging voltage
Vehicle fault
Fault testing
Troubleshooting
Voltmeter
shows
high
voltage.
a. Check the voltmeter
for damage
Test the voltage at alternator terminal B+ and it should be
usually(27~28.4) V. A normal voltage indicates a larger voltmeter
calibration value error, and repair or replacement is required.
b. Check the charging
system wires and
joints, and check if the
terminal stud is
loosened, virtual
connected and
overheated, and if the
wire is shorted to
alternator housing.
a. In case of poor contact, retighten loosened connection and reinsert
connector into place.
b. In case of short circuit, reconnect the wires.
c. Check whether
battery is working
normally.
a. Check if the charging current value changes greatly (drops from 50A to
less than 10A) in a short period of time while battery is being charged; and
replace the battery as early as possible if not.
b. Check if battery surface is clean and dry, and if the terminal fits with
clamp properly; replace timely if any damage is found.
d. Test output voltage
at phase terminal of
alternator (which
should be about half
of the output voltage
at B+).
When the output voltage at phase terminal (W/R/AC) is greatly different
from normal output voltage value, and big voltage drop is caused by
alternator with load, alternator rectifier bridge or stator fault,
reconditioning or replacement should be considered.
e. The fault symptom
still exists after the
above tests finished.
Replace the alternator regulator, rotor or alternator.
