CHRYSLER SERVICE MANUAL
ELECTRICAL SYSTEM—105
22.
TESTING GENERATOR COMPONENTS
a. Testing Armature
for
Ground
Place one probe from 110-volt test lamp on arm-
ature shaft and other probe
at
end
of
any com-
mutator
bar. If
test lamp lights,
it
indicates
a ground.
Do not
touch shaft bearing surface
or commutator
bar
brush surface with test
probe as this will pit surfaces. Replace grounded
armatures.
b.
Testing Armature
for
Short Circuit
Place armature
in
growler and, while rotating
armature, hold thin steel blade parallel
to
core
and just above it.
A
shorted armature will cause
steel blade
to
vibrate
and be
attracted
to
core.
Replace shorted armature.
c. Testing Field Frame Assembly
for
Ground
Disconnect "ARM" terminal field lead from
in-
sulated brush holder. Touch
a
110-volt lamp
probe
to
generator "FIELD" terminal post,
while holding other probe against good ground
on field frame
(be
sure brush lead terminals
are
not
touching
a
ground).
The
lamp should
not light.
If
lamp lights,
a
ground exists,
and
it will
be
necessary
to
determine whether
ground
is in
field coils
or
field terminal post.
Remove terminal post from field frame
and
retest from field lead
to
ground.
If
lamp lights,
field coils
or
connecting lead
is
grounded. Move
connecting lead between
two
coils away from
frame.
If
light still burns, ground
is in
field
coils.
Touch
one of
110-volt test lamp probes
to
"ARM" terminal post and field frame.
If
lamp
lights,
it
indicates that either terminal post
or
brush holder
is
grounded. Remove terminal post
and retest brush holder.
If
lamp still lights,
brush holder
is
grounded. Replace defective
parts.
It is
necessary
to
replace field frame
if,
insulated brush holder
is
grounded.
d. Testing Field Current Draw (Fig.
9)
Test field coils
for
short circuits between wind-
ings,
high resistance connections,
or for im-
proper coils,
by
connecting test equipment,
as
shown
in
Figure
9.
Adjust battery voltage
to
specified voltage
of
10-volts with rheostat.
The
reading
on
ammeter indicates field current
draw.
A
current reading that exceeds
1.2 to
GENERATOR
FIELD
FRAME
CARBON PILE RHEOSTAT
56x1.45
Fig.
9—Testing Field Current Draw
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