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Troubleshooting Guide
30 Amp Regulated Battery Charging System
Output tests should be made with engine running at 3600 RPM - no load. Battery must be fully charged.
Problem
Test
Conclusion
Remove 4 Input leads from rectifier-regulator.
Set ohmmeter on Rx1 scale and zero scale.
1a. Connect ohmmeter across red leads and
1a. Resistance should be
2.0
ohms.
check resistance.
1b. Connect ohmmeter across black leads and
1 b. Resistance should be
0.
1 ohms.
check resistance.
1c. Measure the resistance from each stator
1c. Resistance should be Infinity ohms
lead to ground.
(no continuity).
Replace stator If specified values are not
No
found.
Charge
2.
Connect leads of flashlight type continuity
2.
Lamp off In one direction. on when leads are
To
tester from BAT NEG to one AC terminal,
reversed.
Battery
then reverse leads. Repeat procedure on
Diodes In regulator are good.
the other AC terminal.
Replace rectifier-regulator If lamp Indication Is
the same In both directions.
3.
Remove red lead from REG terminal (all
3.
Charging system output less
20
amps.
other leads connected to appropriate ter-
Faulty regulator winding on stator, replace
mlnals). If unit does not have ammeter,
connect ammeter between + BAT REG
stator.
terminal and battery. Start engine and
operate at full speed.
1.
Remove two red leads from rectlfler-regu-
1 .
Charge rate Is 4 amps or less. Stator Is good.
Battery
lator, connect these two leads together.
Replace rectifier-regulator.
Continuously
Start engine and operate at full speed.
Charges At
High Rate
ELECTRIC STARTING SYSTEMS
There are three types of starters used in the K
series of engines. The three types are:
Motor-Generator - This starter also functions as a
DC generator. In the starting mode, it turns the
crankshaft through a V belt arrangement. The V
belt transmits turning force from a small pulley on
the motor-generator to a large pulley on the
crankshaft.
Wound-Field Bendix Drive Starter - In the field-
wound starters, electrical current flows through
coils to build up a strong magnetic field to turn the
armature. When the armature starts to rotate, a
drive pinion moves forward on the armature shaft
and meshes with a ring gear on the flywheel. The
armature and ring gear remain engaged until the
engine starts to run. When the flywheel begins to
turn faster than the starter, the pinion is thrown
from the ring gear and returns to the disengaged
position. A small anti-drift spring on the armature
8.18
Charging system continues to charge at high
rate. Regulator winding shorted, replace stator.
shaft holds the pinion in this position as the starter
slows to a stop.
Permanent Magnet Bendix Drive Starter - Opera-
tion of this type starter is the same as that of the
wound-field starter. The major difference between
the two is in the method of generating the mag-
netic field to turn the armature. This starter uses
strong permanent magnets in place of field coils.
Safety Interlocks
In an effort to enhance safe operation of their
equipment, many manufacturers install safety in-
terlocks to prevent engine start before certain
safety requirements are met. These interlocks are
usually incorporated in the starter circuit. Unless
all interlock switches are closed, the starter will
not function.
Before servicing a starter that is reported to have
failed, always check the safety interlock system
first. This is done by bypassing the interlock
switches with a temporary jumper wire.
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