CHRYSLER SERVICE MANUAL
ELECTRICAL SYSTEM—121
inoperative
or
fluctuating panel unit
may be
due
to
dirty circuit breaker points. Clean points
by drawing strip
of
sandpaper between them.
If pointer
has
tendency
to
stick
or
bind, free
it
up by
aligning bearings,
or
adjusting
end
play. This
can be
done
by
carefully bending
bearing supports.
a. Testing Wires from Panel Unit
to
Tank Unit
If wires
at
terminals
on
tank unit
are
reversed,
panel unit will show "empty" when tank
is
"full".
If
wires
at
terminals
are
grounded
or
open circuited, panel unit readings will vary.
The wires
can be
checked
in
following manner.
Make sure that panel unit
is
operating proper-
ly. Remove tank unit
and
ground case
of
tank
unit body with jumper wire. Refer
to
Fuel
Gauge Readings Chart
for
gauge readings
un-
der varying grounded
or
open circuited
con-
ditions.
For
example, when float
arm is
placed
in empty,
1/2
full,
and
full position,
and
gauge
readings
are
empty,
%
full
and V2
full,
re-
spectely,
the No. 1
wire
is
grounded.
b.
Adjusting Panel Unit
Remove panel unit from
car and
position
it
on bench
in
same manner
it is
mounted
on in-
strument panel.
It is
important that unit
be
shielded against
air
currents which would cause
a calibration error. Connect
"SW"
terminal
of
panel unit
to
battery. Connect tank unit
to
panel unit
and
make sure that
No. 1 and No.
2 wires
are
connected
to
their respective
ter-
minals. Connect case
of
tank unit
to
other
bat-
tery post.
Allow unit about one minute
to
warm
up and
then move float
arm to
empty position.
If
point-
er stops short
of
empty mark, loosen
"SW"
terminal
nut and
move left calibrating
arm to
right.
If
pointer goes beyond empty mark move
calibrating
arm to
left. Move float
arm to
full
position. Adjust right calibrating
arm to
right
to raise pointer,
and to
left
to
lower
it.
Check
settings
by
moving float
arm to
empty
and
full
positions. Readjust calibrating arms
if
neces-
sary.
55.
ELECTRIC TEMPERATURE GAUGE
The electric
(or
magnetic) temperature gauge
consists
of
two units, dash unit
and
engine unit.
The gauge
is
connected
to
source
of
voltage
through ignition switch,
by
jumper wire from
fuel gauge
to
temperature gauge.
a. Dash Unit
The dash unit
(Fig. 32) has two
magnetic
poles.
One of
windings
is
connected
to
ignition
switch
and to
ground.
The
other winding
in
dash unit connects
to
ground through engine
unit.
b.
Engine Unit
The engine unit
is
equipped with
a
flat disc that
changes resistance
as its
temperature varies.
56.
TESTING THE ELECTRIC TEMPERATURE
GAUGE CIRCUIT
a. Test
1
Disconnect wire
at
engine unit
and
turn
on
VARIABLE RESISTANCE
VARIABLE FIELD
POLE SHOES
CONSTANT FIELD>
IGNITION SWITCH
AMMETER
DASH UNIT
ENGINE UNIT
53x527
Fig.
32—Electric Temperature Gauge
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