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ELECTRICAL SYSTEM
DESCRIPTION
A 12'-volt, negat.ive g
r
ound
electrica
l
system
has
been incorporated in all 1956 Model
Chrysler
cars.
The 12-volt
system
is being llsed to meet the
electrical
requiremenl,;
for
starting and
igni-
tion
with
higher
compression
engines. The
neg-
ative
ground system was adopted to
allow
for
the use of the new
transistor
type
of
r.adio in-
stallations.
The
change from six to
12-volts
and from
a
positive to a negative
ground system
has
created
the need for
a completely
new electrical
system
in
all
1956
Chrysle
r
Cars.
A
green
name
plate ident.ifies a unit
of the
12-
volt system.
The
six-volt system
used a red
name
plate.
The methods of servicing and of testing
the
new 12-volt
system
and its
components
requires
the use
of
testing equipment that
is
capable
of
testing
12-volt
systems.
BATTERY
The
C-711\1odel Chrysler
is
equipped
with an 11
plate, 60
ampere
hour 12-volt Willard
battery
(1I0-ll-60) (West Coast releases use Auto-Lite
ll-HS-60).
Fig. 1 - Typical
12-Valt
Battery
(Cut-a-way
View)
25
The
C-72,
C-73 and C·70 Model
Chrys!ers use
a
13 plate, 70 ampere hOUr 12-volt
Auto-Lite
battery
(12-H-70).
Figure 1.
BATTERY TESTING
A number
of quick
checks and tests
can be made
on
a battery
to determine
whether
or not cor-
rective maintenance is required. These
checks
can be clmisified
as follows:
1.
Visual Inspection.
2. Specific Gravity Test.
3.
Voltage Tests (Open Circuit
and
Ca-
pacity).
Visual Inspection
I nspect the
electrolyte
level,
inspect for cracked
case
and
check
hold down
clamps
for
proper
tightening. Check the top of the battery for dirt
and excessive corrosion.
The battery
should be
free of
accumu
lations of
dirt; excessive
corro-
sion
is an indication
of electrolyte leakage or
boiling
over
due to
a high
charging rate. Corro-
sion can also
be
caused from overfilling the
battery when
adding
water.
Specific Gravity
Test
Test the specific graviLy of the battery with an
accurate hydrometer.
Where
the electrolyte
level
is
too low to
make
a test add the battery
water but do
not attempt
to test the gravity
until
the
battery
has been returned
to :-;ervice
operation for at
leal'L
fOur hours of normal
driving.
The
specific gravity of the
electrolyte
will
vary 4 points
(.004)
with
every
10
degrees F.
change
in
temperature. Subtract (.004) four
points for each 10
degrees below and add .004
for each
10
degrees above 80 degrees
F. Read-
ings must be
corrected Lo 80 degrees F. before
interpreting as
follow~:
A fully charged battery has
a specific gravity
reading
of
1.280 to 1.300
for all batteries for
use in temperate
climates.
A battery that has a
specific
gravity reading
of 1.250 or less and all
cells
read evenly within
30
specific
points (.030) of each
other
requires
recharging.
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