122—ELECTRICAL SYSTEM
CHRYSLER SERVICE MANUAL
ignition. The gauge hand should stay against
left side stop pin.
b.
Test 2
Ground wire disconnected from engine unit and
turn on ignition. The gauge hand should swing
across dial to right side stop pin.
c. Test Results and Corrective Measures
Item 1—If gauge hand does not stay on left
hand stop pin in Test 1, wire is grounded be-
tween dash unit and engine unit, or dash unit
is defective. Test further by disconnecting wire
at dash unit "GA" terminal and turn on igni-
tion switch. If gauge hand now stays on left
hand stop pin, replace wire. But, if gauge hand
still moves, replace dash unit.
Item 2—If gauge hand does not swing across
dial in Test 2, there is an open circuit in wire
between dash unit and engine unit, dash unit
is defective, or no power is reaching dash unit.
Test further by grounding "GA" terminal on
dash unit and turning on ignition switch. If
gauge hand now moves, replace wire. If gauge
hand still does not move, connect 12-volt test
lamp from dash unit ignition terminal to
ground. Turn on ignition switch. The test lamp
should light. If test lamp lights, replace dash
unit. But, if test lamp does not light, test wire
between ignition switch and dash unit by con-
necing test lamp to "Accessory" terminal at
ignition switch and to ground. When this is
done, test lamp should light.
Item
3—If
gauge hand operates correctly in
in Test 1 and Test 2, but gauge does not in-
dicate temperature changes correctly, engine
unit is defective, or dash unit is not calibrated
properly. Use an engine unit that is in good
condition. Then, if gauge is still not accurate,
replace dash unit.
Item 4—If gauge hand is at right hand stop
pin (maximum) at all times, and Test 1 and
Test 2 indicate that wiring and dash unit are
in good condition, the engine unit is defective.
Install new engine unit. If gauge hand will not
move, dash unit is damaged or incorrectly in-
stalled. Install unit correctly, or replace as
necessary.
57.
TESTING THE OIL PRESSURE GAUGE
Test oil pressure gauge by hooking up an ac-
curate gauge and comparing readings. The
hook up can be made by using "Tee" fitting at
flexible hose connection. Warm up engine and
compare readings for idle and normal driving
pressures.
Be sure that oil level is checked before mak-
ing this check. An oil gauge pointer that flutters
is usually an indication that oil has entered
oil tube connecting gauge to engine block. The
tube should have air in it to cushion pulsations
of oil pump and oil relief valve. The fluttering
pointer may be result of leak in oil gauge tube
or due to improper installation. To correct this
condition, disconnect tubing at gauge and en-
gine block, and drain out oil. Connect tubing
at gauge first and then at block.
Test for possible plugging by breaking con-
nection at gauge. Hold gauge end of line over
an empty, clean container and start engine. The
oil should flow at a steady rate. If it does not
flow steadily, tube may be kinked or plugged.
Check y
32
inch hole in gauge tube nipple in
block. If it is plugged, this hole can be cleaned
with a fine pin.
If oil lines are open and gauge does not op-
erate, small hole leading into tube may be
plugged. The hole can also be cleaned out with
a pin.
58.
SPEEDOMETER
When speedometer fails to indicate speed or
mileage, cable or housing is probably broken.
a. Speedometer Cable
Most cables are broken due to lack of lubrica-
tion, a sharp bend or kink in housing. A cable
may break if speedometer head mechanism
binds.
If such is the case, speedometer head
should be repaired or replaced before new cable
or housing is installed.
A "jumpy" pointer condition (together with
a sort of scraping noise) is due, in most in-
stances, to dry or kinked speedometer cable.
The kinked cable rubs on housing and winds
up,
slowing down pointer. The cable then un-
winds and the pointer "jumps". To check for
kinks,
remove cable, lay it on flat surface, and
twist one end with fingers. If it turns over
smoothly, the cable is not kinked. But, if part
of cable flops over as it is twisted, cable is
kinked and should be replaced.
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