30—ELECTRICAL SYSTEM
CHRYSLER SERVICE MANUAL
50.
CIRCUIT BREAKERS
The Headlight circuit breaker (22i/
2
amperes)
is integral with light switch, and the Wind-
shield Wiper circuit breaker (6 amperes) is
on back of wiper switch on Imperial Models
and on bracket behind clock of the LC-1-2-3
Models. The Convertible Coupe Top Lift cir-
cuit breaker (25 amperes) is on top light
switch.
The Rear Compartment Cigar Lighter cir-
cuit breaker is 8 amperes on Four Door Sedans
and Convertible Coupes, and the window lift
circuit breaker, is 20 and 30 amperes. They
are located behind left front kick panel on side
cowl. The Seat Lift circuit breaker (40 am-
peres) is behind left 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. The system is con-
nected to battery through ignition switch. The
gauges operate only when ignition switch is in
"Accessory" or "ON" position (Fig. 34).
A single wire connects electro-magnet and
tank unit, and the tank unit case is grounded.
As fuel in tank moves from "full" to "empty",
a change in magnetic field surrounding variable
field magnet (Fig. 34) takes place. This change
in the magnetic field causes the gauge hand
indicating the amount of fuel in the tank to
move from "full" to "empty".
52.
TESTING THE ELECTRO-MAGNETIC
FUEL GAUGE
For following tests, ignition switch must be
turned counter-clockwise to "Accessory", or ex-
treme left hand position.
a. Testing Wire from Ignition Switch
to Panel Unit
Connect one wire of test lamp to "SW" ter-
minal 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
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)
Fig.
34—Electro Magnetic Fuel Gauge Circuit
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
Disconnect wire
at
both ends. Connect test
lamp between
"AM"
terminal
of
ignition
switch
and one end of
wire.
If
lamp lights,
wire
is
grounded
and
should
be
repaired.
If
lamp does
not
light, ground opposite
end of
wire.
The
lamp should light;
if it
does
not, the
wire
is
broken
and
should
be
replaced.
IMPORTANT
To get good electrical contact at terminals,
place a shake-proof type washer on terminal
stud before installing wire. The prongs of wash-
er will dig into mounting and form a good
contact.
d. Testing Panel Unit and Tank Unit
If previous tests indicate that panel unit
is re-
ceiving current when ignition switch
is
turned
on, panel
and
tank units
are
properly grounded,
and wire between units
is in
good condition,
test panel unit
and
tank unit
as
follows:
Use spare tank unit that
is in
good condition
and same type. Some types
of
tank units
may
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