CHRYSLER SERVICE MANUAL
ELECTRICAL SYSTEM—99
3.
TESTING STARTER CURRENT RESISTANCE
AND CURRENT DRAW
Test battery. If it tests 1,230 specific gravity
or less, charge battery. Test circuit resistance
and starter current draw at same time (Fig. 3).
Disconnect battery lead from battery ter-
minal post. Connect an 0 to 300 scale ammeter
between disconnected lead and battery terminal
post. Connect a test voltmeter with .10 volt
scale divisions between battery positive post
and starter switch terminal.
Crank engine and observe readings on volt-
meter and ammeter. The voltage should not
exceed .12 volt per 100 amperes of current. The
current should not exceed 150 amperes (warm
engine and battery). A reading of voltage that
exceeds .12 volt per 100 amperes indicates
there is high resistance caused from loose cir-
cuit connections, defective cable, burned switch
contacts or, in some instances, a short in starter
which causes a voltage leak. A current that is
high (150 amperes or more), and is combined
with slow cranking speed, indicates that starter
should be removed and repaired. A current
that is low, with slow cranking speed, indicates
resistance in starter such as burned commuta-
tor and worn brushes.
4.
REMOVAL OF STARTER
Disconnect battery cable from battery. Raise
car and disconnect cable and solenoid lead wire
from solenoid switch. Remove starter attaching
bolts and remove starter assembly.
5. TESTING THE STARTER MOTOR
(ASSEMBLED)
a. Free-Running Test
Place starter in vise and connect a fully-
charged, 12-volt battery to starter as follows:
Connect a test ammeter (100 ampere scale)
and carbon pile rheostat in series with battery
positive post and starter terminal. Connect
voltmeter (15 volt scale) across battery. Rotate
carbon pile to full-resistance position. Connect
battery cable from battery negative post to
starter frame. Adjust rheostat until battery
voltage shown on voltmeter reads 10 volts. The
current draw should be 60 amperes, with a min-
imum armature speed of 3,200 r.p.m.
b.
Stall Test
Install starter motor in test bench. Follow in-
structions of equipment manufacturer and
check stall torque of starter against following
specifications. With applied battery voltage ad-
justed to 4 volts, stall torque should be 6.5
foot-pounds, minimum, with a current draw of
240 amperes.
6. DISASSEMBLING THE STARTER (FIG. 4)
Remove solenoid switch. Remove through bolts
and tap commutator end frame from field
frame. Lift brush springs and raise brushes
from commutator. Hold brushes up by placing
springs against ends of brushes. Tap drive end
housing free from dowel pin and remove drive
end housing and armature assembly from field
frame. Remove shield plate attaching screws
and remove drive end housing from armature
and drive assembly. To remove drive from arm-
ature, remove lock ring and slide starter drive
from armature. The brush holders are riveted
to field frame and are not serviced separately.
7. CLEANING THE STARTER PARTS
Do not immerse parts in cleaning solvent. Im-
mersing field frame and coil assembly and/or
armature will damage insulation. Wipe these
parts with cloth only.
Do not immerse drive unit in cleaning sol-
vent. The drive clutch is pre-lubricated at fac-
tory and solvent will wash lubrication from
clutch. The drive unit may be cleaned with
brush moistened with cleaning solvent and
wiped dry with cloth.
8. REPLACING BRUSHES AND SPRINGS
Brushes that are worn more than 1/2 the length
of a new brush, or are oil-soaked, should be re-
placed. The starter must be disassembled to
install brushes and springs. New springs should
be installed when replacing brushes.
9. TESTING THE ARMATURE
a. Testing the Armature for Short Circuit
Place armature in growler and hold a thin
steel blade parallel to core and just above it,
while slowly rotating armature in growler. A
shorted armature will cause blade to vibrate
and be attracted to core. Replace a shorted
armature.
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