10—ELECTRICAL SYSTEM CHRYSLER SERVICE MANUAL
Disconnect battery lead from positive battery
terminal post. Connect 0 to 300 scale ammeter
between disconnected lead and battery terminal
post. Connect a test voltmeter with .10 volt
scale divisions between the removed battery
cable lug and solenoid switch motor terminal.
Crank engine and observe readings on volt-
meter and ammeter. The voltage should not
exceed .20 volt per 100 amperes of current. The
current should not exceed 150 amperes (warm
engine and battery). A reading of voltage that
exceeds .20 volt per 100 amperes indicates
there is high resistance caused from loose cir-
cuit connections, defective cable or burned
switch contacts. 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 solenoid switch or loose brush pigtail or
soldered lead 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 attach-
ing 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 starter. Ro-
tate carbon pile to full-resistance position.
Connect battery cable from battery negative
post to starter frame. Adjust rheostat until
starter voltage shown on voltmeter reads 11
volts.
The current draw should be 80 amperes,
with a minimum armature speed of 3800 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 8.5
foot-pounds, minimum, with a current draw
of 350 amperes.
6. DISASSEMBLING THE STARTER
(TIG.
4)
Remove clevis pin from solenoid plunger link-
age.
Remove thru bolts and tap commutator
end plate from field frame. Lift brush holder
arms so brushes are raised from commutator.
Hold brushes up by use of "U" shaped clips
to outside of frame. 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.
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
y%
the length
of a new brush, or are oil-soaked, should be re-
placed. The starter must be disassembled to
install brushes and springs.
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.
b.
Testing Armature for Ground
Touch armature shaft and end of a commutator
bar with pair of test lamp test prods. If lamp
lights,
it indicates a grounded armature. Re-
place grounded armature.
c. Testing Commutator RunOut, Refacing
and Undercutting
Place armature in pair of "Vee" blocks and
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