CHRYSLER SERVICE MANUAL
ELECTRICAL SYSTEM—119
A switch showing voltage drop
of
more than
one-tenth
of a
volt,
or
wire showing
a
voltage
drop
of
one-tenth
of a
volt should
be
replaced.
If
any
wire
in
lighting circuit
has
been
re-
placed with other than standard equipment
wire,
it may
lack capacity
and
cause voltage
drop.
The
most important wire
in
entire
pri-
mary circuit
is
wire that
is
connected from
starter switch
to
ammeter, because
it
must
carry full load
of all
branching circuits.
50.
CIRCUIT BREAKERS
The Headlight Circuit Breaker
(20
amperes)
is
on back
of
light switch,
and the
Windshield
Wiper Circuit Breaker
(5
amperes)
is on
back
of wiper switch.
The
Convertible Coupe
Top
Lift Circuit Breaker
(25
amperes)
is on top
lift switch.
The Rear Compartment Cigar Lighter
Cir-
cuit Breaker, four-door sedan
and
convertible
coupe
(8
ampere),
and
Window Lift Circuit
Breaker,
(is 20
amperes). They
are
located
behind left front kick panel
on
side cowl.
The
Seat Lift Circuit Breaker
(20
amperes)
is be-
hind left front kick panel
on
side
of
cowl.
51.
DESCRIPTION AND OPERATION
OF FUEL GAUGES
The fuel gauge system incorporates
an
electro-
magnetic unit
on all
models except Town
and
Country Wagons, which
use a
thermostatic
CONSTANT FIELD
(EMPTY POSITION)
POLE
SHOES
VARIABLE FIELD
(FULL POSITION)
\
TANK UNIT
STARTER-IGNITION SWITCH
(NOTE—FUEL GAUGE
OPERATES ONLY WHEN
IGNITION SWITCH
IS
TURNED
ON)
gauge.
The
system
is
connected
to
battery
through ignition-starter switch.
The
gauges
operate only when ignition switch
is in "Ac-
cessory"
or
"On" position
(Fig. 30).
A single wire connects electro-magnet
and
tank unit,
and
tank unit case
is
grounded.
As
fuel
in
tank moves from "full"
to
"empty,"
a
change
in
magnetic field surrounding variable
field magnet
(Fig. 30)
takes place. Then,
the
gauge hand moves, indicating amount
of
fuel
in tank.
The thermostatic fuel gauge
in
Town
and
Country Wagons
is
connected
to
tank unit
by
two wires. The panel unit contains two bimetal
blades heated by resistance wires wound around
each blade. Terminals "1"
and "2" on
panel
unit are connected
to
terminals
"1"
and "2"
on
tank unit. When the fuel level changes,
float
arm
moves
a
contact finger across
a
resistance in the
tank unit. This varies current
to
each winding
in panel unit, raising and lowering temperature
of bimetal blades.
The
blades bend depending
upon heat received from windings, moving
gauge pointer.
52.
TESTING THE ELECTRO-MAGNETIC
FUEL GAUGE
(Refer
to Fig. 30). For
following tests,
ig-
nition switch must
be
turned counter-clockwise
to "Accessory,"
or
extreme left hand position.
a. Testing Wire from Ignition Switch
to Panel Unit
Connect one wire
of
test lamp to "SW" terminal
on panel unit
and
connect other wire
to a
ground.
If
lamp lights when ignition switch
is
turned
on,
this circuit
is in
good condition.
b.
Testing Panel
and
Tank Units
for
Ground
The panel unit
and
tank unit must have good
grounds
to
operate properly.
Use
jumper wire
to temporarily ground each unit
at
case.
If
gauge reading changes when temporary ground
is made, make sure that case
of
unit under test
is properly grounded. Clean and tighten mount-
ing screws
of
panel unit. Clean contacting sur-
face
of
tank unit,
and
make sure retainer
is
tight.
c. Testing Wire Between Panel Unit
and Tank Unit
Fig.
30—Electro-Magnetic Fuel Gauge Circuit
Disconnect wire
at
both ends. Connect test lamp
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