Electric System
EL-8
Trouble analysis
Note:
The self-excitation speed is very low (about 1000r/min) with battery operation. So be sure to see if the charg-
ing indicator is perfect or not during the operation.
Alternator negative earthing.
Be sure to use the original factory's parts as possible if it has to replace the diode.
During the alternator operation, if the temperature of the casing reaches to 105℃＋ambient temperature, and
the output of the alternator is normal, the alternator is not burnt down.
Trouble Cause Method
Charging indicator does not
extinguish and the truck
starts difficultly during
operation
Short circuit or too large contact resistance
Check the circuit and
repair or replace the
damaged parts
Short circuit between the 3 phases and rotor winding and
casing
Diode damaged
Regulator failed
Charging current is too
small, the battery is insuffi-
cient. No charging at low
speed.
Output voltage is over low.
Exclude the trouble
and replace the dam-
aged parts
Diode is partly damaged
The rotor winding has 1 phase or 3 phases bad contact
Slipping belt
The instrument indicator
sometimes charges and
sometimes not
Belt is too loose and slippery.
Tighten the contac-
tors, and replace the
instrument if it is dam-
aged.
Built-in regulator works abnormally
The contact from engine fire wire connector to battery
connector is loose
Alternator interior connection is loose.
Instrument failed
Engine has abnormal noise
during running.
Belt is loose or worn, shaken during running
Adjust the belt,
replacebearing
Bearing damaged or too large clearance
Too large clearance of bearing caused interference
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