ELECTRICAL-BODY AND CHASSIS 12-21
2.
Remove ash tray, retainer attaching screws and
retainer.
3.
Remove Air Conditioning distributor
duct'
retaining
screws and duct.
4.
Remove heater and/or Air Conditioning control panel
assembly retaining screws and push panel assembly
from console.
NOTE:
If interference between control panel
and radio is encountered, loosen radio retaining
nuts.
5. Remove radio control knobs, bezels and retaining
nuts.
6. Disconnect radio wiring harness and antenna lead-in.
7. Remove radio rear brace attaching screw and re-
move ra(Jio from vehicle.
8. Remove ignition switch bezel nut using Tool J-7607
and push switch rearward.
9. Disconnect cigarette wiring connector.
10.
Remove cigarette lighter retainer and lighter as-
sembly from console.
11.
To install, reverse removal procedure.
Fig.
35 - Cigarette Lighter — Chevelle
CHEVROLET INSTRUMENTS AND GAUGES
INDEX
Page
General Description 12-21
Service Operations 12-22
Instrument Cluster........................ 12-22
Instrument Cluster Lamps 12-22
Printed Circuit .
* •
12-22
Speedometer 12-22
Speedometer Cable 12-23
Fuel Gauge 12-23
Page
Clock 12-24
Tachometer 12-24
Ammeter . . 12-24
Temperature Gauge 12-24
Oil Pressure Gauge 12-24
Oil Pressure Indicator 12-24
Generator Indicator 12-26
Temperature Indicator 12-26
GENERAL DESCRIPTION
The standard instrument cluster on all models contains
seven circular housings consisting of: a speedometer;
fuel gauge; oil pressure, generator and temperature indi-
cators; right and left directional signal indicators; brake
warning and high beam indicators; and includes a clock
on deluxe models. An optionally available instrument
cluster provides special instrumentation which includes
in addition to the speedometer and clock: a tachometer;
fuel, oil pressure, ammeter and engine temperature
gauges; which replace the standard fuel gauge and indi-
cator lights. The brake warning indicator is relocated
to the tachometer dial face and the high beam and direc-
tional indicators are positioned in the speedometer dial
face.
Instrument cluster removal is recommended before at-
tempting to service the printed circuit and gauges even
though some units may be accessible from behind the
cluster. Limited working space under the instrument
panel increases the possibility of electrical malfunctions
due to poor connections, and damaged or improperly in-
stalled printed circuit. The printed circuit is service-
able but not repairable and requires complete
replacement.
The brake warning light serves a dual purpose. It
functions as an indicator when the parking brake is ap-
plied and also warns if a malfunction (loss of hydraulic
pressure) should occur in the brake system. The two
separate switches, which provide the signal to operate the
indicator, are located at the parking brake support and in
the hydraulic brake line at the master cylinder. Service
of the brake pressure, differential switch unit at the
master cylinder is described in Section 5 of this manual.
All indicator and cluster illumihating lamps may be
replaced without removing the cluster from the vehicle.
The bulbs are installed in plastic holders which lock into
the cluster housing and make contact with the printed
circuit. An instrument lamp is used to illuminate the
ignition switch. A special fibre optic lucite wiring
transmits light from the lamp to the switch.
Regular maintenance is not required on the instrument
cluster or its components other than maintaining clean,
tight electrical connections, replacing defective parts and
keeping the speedometer cable properly lubricated.
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-24
1.
Temperature Gauge
2.
Instrument Cluster Lamp
3.
R.H. Directional Indicator
4.
Ammeter Gauge
Fig. 39- Optional Gauge Cluster
5. Fuel Gauge
6. L.H. Directional Indicator
7. Tachometer
8. "Brake" Indicator
9. "Bright" Indicator
10.
Oil Pressure Fitting
11.
Chassis Harness Connector
12.
Clock Assembly
13.
Printed Circuit
NOTE:
Observe carefully the stack up of the
internal parts of the fuel gauge assembly.
5. To install, reverse removal procedure.
CLOCK OR TACHOMETER REPLACEMENT
NOTE:
The tachometer is a self-contained, all
transistor unit requiring very little service
other than keeping the terminal nuts clean and
tight. The unit is not serviceable and must be
replaced, if defective.
1.
Remove instrument cluster as previously described
in this section.
2.
For clock replacement, remove clock set shaft knob
at front of console.
3.
Remove cluster lamps from cover, circuit attaching
screws, and terminal nuts at circuit to gauge attach-
ing points.
4.
Move printed circuit away from gauge and remove
screws retaining
•_
gauge or clock to the cluster
housing.
•5.
Remove unit, from housing and cover plate from
gauge unit.
6/To install, reverse removal procedure.
AMMETER TEMPERATURE AND OIL PRESSURE
GAUGES REPLACEMENT
1.
Remove instrument cluster as previously described
iii this section.
2.
Remove instrument lamps, attaching screws or nuts
and wiring connections as required.
3.
Remove gauge assembly backing plate retaining
screws and remove gauge assembly from cluster
housing.
4.
Remove terminal nuts and/or screws retaining gauge
to the backing plate and separate plate from the
gauge.
•
5. To install, reverse removal procedure.
OIL PRESSURE INDICATOR
If the light does not come on when the ignition switch is
turned on, or if the light comes on and remains on after
the engine is started, one or more of the following condi-
tions is indicated:
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY
AND
CHASSIS
12-26
•
Low oil
pressure
• High engine temperature
• Defective wiring
or
switch
connector from sender
in block above starter
on
and
at
left front
of
distributor
on V-8
Sending Unit Replacement
1.
Disconnect wiring harness
unit terminal (located
L-6 engines
engines).
2.
Remove sender unit using Tool J-21757
or 12
point
socket, replace with
new
unit
and
check operation.
GENERATOR INDICATOR
1.
Ignition
on,
Engine
not
Running
and
Telltale Light
Off.
• Indicator bulb burned out, replace bulb.
• Open circuit
or
loose connection
in the
telltale
light circuit.
2.
telltale Light Stays
on
after Engine
is
Started.
If indicator light does
not go out at
engine idle
speed, refer
to
Charging Systems under Engine
Electrical, Section
6Y.
TEMPERATURE (COOLING SYSTEM) INDICATOR
The temperature indicator circuit consists
of two re-
motely located units, indicator gauge
and
engine sender
unit.
The
indicator gauge, located
in the
instrument
panel, consists
of a
red light which will indicate
an
over-
heated engine condition.
Engine Sender Unit Replacement
1.
Drain engine cooling system
to a
level below unit.
2.
Remove sender unit (located
in the
inlet manifold
near water pump housing
on V-8
engines and
in the
cylinder head near
an
exhaust port
oh L-6
engines)
and replace with new unit.
3.
Refill cooling system
and
check operation
of
unit.
CHEVELLE INSTRUMENTS AND GAUGES
INDEX
Page
General Description
* *
i2-26
Service Operations
12-26
Instrument Panel
12-26
Instrument Cluster.
12-26
Fuel Gauge and/or Ammeter
12-27
Clock,
i 12-27
Speedometer
12-27
Page
Speedometer Cable
.
. 12-27
Temperature Gauge
12-29
Oil Pressure Gauge
12-29
Indicator Lights.
. 12-29
Oil Pressure Indicator
12-29
Generator Indicator
. . 12-29
• Temperature Indicator
12-29
GENERAL DESCRIPTION
The Chevelle instrument cluster assembly consists
of:
a speedometer;
a
fuel gauge;
a
generator,
an
engine
tem-
perature and an
oil
pressure indicator lamp, and includes
a clock
on
deluxe models.
On
super sport models,
am-
meter, coolant temperature
and oil
pressure gauges
re-
place
the
appropriate indicator lights. Except
for the
speedometer,
all of the
indicator lamps, instruments
and
gauges
of
these clusters may
be
serviced without remov-
ing
the
instrument cluster assembly from
the
vehicle.
In addition
to the
instrument indicator lamps,
a
brake
warning lamp
is
included
in the
cluster
as
standard
equipment.
The
indicator
is
connected
to the
parking
brake
and
brake pressure differential switches
and
serves
a
dual function.
It
lights when the parking brake
is applied
and
also when
the
brake pedal
is
applied,
if a
malfunction should occur
in the
brake system
due to a
loss
of
hydraulic pressure. Servicing
of the
hydraulic
pressure differential switch
is
covered
in
Section
5 of
this manual.
Regular maintenance
is not
required on the instrument
cjLuster
or its
components other than maintaining dean
and tight electrical connections, replacing defective parts
and keeping
the
speedometer cable properly lubricated.
SERVICE OPERATIONS
INSTRUMENT PANEL ASSEMBLY
INSTRUMENT CLUSTER (Figs.
41
thru
44)
Removal
1.
Disconnect battery ground cable.
2.
Remove steering coupling bolt and disconnect steer-
ing shaft from coupling.
3.
Loosen mast jacket lower clamp.
4.
Remove
air
conditioning center distributor duct
(if
so equipped).
5. Remove radio rear support bracket screw.
6. Remove mast jacket upper support clamp and retain-
ing bolts from lower support (refer
to
Section
9,
Steering).
CAUTION: Cover mast jacket
and
parl
brake handle with
a
suitable material
to
prevc
scratching.
7.
Disconnect speedometer cable
at
rear
of
cluster
housing
and
speed warning control knob
at
panel
(if
so equipped).
8. Remove instrument panel retaining screws (nine
upper and five lower).
.
9. Working under the console remove four lower retain-
ing screws from instrument cluster housing.
10.
Pull instrument panel assembly from console and
lay
forward on mast jacket.
11.
Disconnect wiring harness, cluster lamps and wiring
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY
AND
CHASSIS
12-31
CHEVY II INSTRUMENTS AND GAUGES
INDEX
Page
Page
General Description -.....
12-31
Service Operations.
12-31
Instrument Panel
. 12-31
Instrument Cluster
12-31
Fuel Gauge
12-32
12-32
Clock,
Speedometer
12-34
Speedometer Catte
12-34
Indicator Lights
12-34
Oil Pressure Indicator
12-34
Generator Indicator
12-34
Temperature Indicator
12-34
GENERAL DESCRIPTION
The Chevy
n
instrument cluster assembly consists
of:
a speedometer;
a
fuel gauge;
a
generator, temperature
and
oil
pressure indicator lamps, and includes
a
clock
on
deluxe models. Except
for the
speedometer,
all of the
cluster lamps, instruments and gauges
of
the cluster
may
be serviced without removing
the
instrument cluster
as-
sembly from
the
console.
In addition
to the
instrument indicator lamps,
a
brake
warning lamp
is
included
in the
cluster
as
standard
equipment.
The
indicator
is
connected
to
thfc parking
brake and brake pressure differential switches andserves
a dual function.
It
lights when
the
parking brake
is ap-
plied
and
also when
the
brake pedal
is
applied,
if a mal-
function should occur
in the
brake system
due to a
loss
of
hydraulic pressure. Servicing
of the
hydraulic pressure
differential switch
is
covered
in
Section
5 of
this manaul.
Regular maintenance
is not
required on
the
instrument
cluster
or its
components other than r^Mfitftl^i^g clean
and tight electrical connections, replacing defective parts
and keeping
the
speedometer cable properly lubricated.
SERVICE OPERATIONS
INSTRUMENT PANEL
INSTRUMENT CLUSTER
Removal
and
Installation {Figs.
45
thru
48)
1.
Disconnect battery ground cable.
2.
Remove mast jacket upper support clamp (refer
to
Steering, Section
9, for
complete procedure
on low-
ering jacket) and lower steering column.
NOTE:
Apply protective material
to the
mast
jacket
to
prevent damage
to the
painted surfaces.
3.
Disconnect retaining collar securing speedometer
cable
to
speedometer head.
4.
Remove screws retaining cluster
to
console.
5. Pull cluster forward
of
console opening and discon-
nect
all
wiring
and
lamp connections. Remove
cluster from vehicle.
CAUTION:
Do not
pull cluster outward further
than slack
in
wiring harness will allow, other-
Fig.
45-
Instrument Cluster Installation
—
Chevy
II
Fig.
46 -
Speed Warning Device
CHEVtOtET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-32
Fig.
47-
Instrument Clyster Wiring
1.
Instrument Cluster Bulb
2.
R.H. Directional Indicator
3. Bright Indicator
4.
Gen Indicator
5. Temp Indicator
6. Oil Indicator
7. L.H. Directional Indicator
8. Fuel Gauge Connector
9. Instrument Panel Wiring
Harness
10.
Clock Assembly (11700-800)
11.
Cover (exc. 11700-800)
12.
Plate (exc. 11700-800)
13.
Brake Alarm
indicator
wise wiring and lamp connections may be
damaged."~ ' ""
6. To install, position cluster to console opening and
connect all wiring and lamp connections.
7. Position cluster in console and attach speedometer
cable to the speedometer head.
8. Install eight screws retaining cluster to console.
9. Install mast jack upper clamp assembly.
10.
Connect battery ground cable and check operation of
instruments and gauges.
FUEL GAUGE REPLACEMENT
1.
Disconnect battery ground cable.
2.
Disconnect cluster lamp and wiring harness connec-
5.
tions at rear of gauge.
Remove two screws retaining gauge to rear of
cluster housing and remove gauge from housing.
Remove terminal nuts attaching gauge unit to cover
plate and remove unit, from plate.
To install, reverse the removal procedure*
CLOCK REPLACEMENT
1.
Disconnect battery ground cable.
2.
Remove clock set shaft, knob retaining screw and
knob from set shaft.
3.
Disconnect wiring and lamp connections "from rear
o£ clock.
4.
Remove two screws attaching clock to rear of hous-
ing and remove clock from cluster housing.
CHevnou-r ousst
ELECTRICAL-BODY AND CHASSIS 12-34
5. To replace, reverse the removal procedure.
SPEEDOMETER REPLACEMENT
1.
Remove instrument cluster as previously described
in this section.
2.
Remove clock set shaft knob.
3.
Remove eight screws securing cluster housing to
bezel trim panel. Separate parts carefully observing
stack up of parts.
4.
Remove two screws securing speedometer head to
rear of cluster housing.
NOTE:
Servicing of the speedometer head
should be performed by an authorized AC Speed-
ometer Service Station.
5. To install, reverse the removal procedure..
SPEEDOMETER CABLE
Replacement or Lubricatibn
1.
Disconnect the speedometer cable from the speed-
ometer head. Remove the old cable by pulling it out
from speedometer end of conduit.
NOTE:
If old cable is broken it may be neces-
sary to remove lower piece from transmission
end of conduit.
2.
Lubricate the lower 3/4 of cable with speedometer
cable lubricant and push the cable into the conduit.
Connect the upper end to the speedometer head and
road test vehicle for proper speedometer operation.
INDICATOR LIGHT REPLACEMENT
To replace any indicator or cluster bulb, unsnap the
proper socket from rear of instrument cluster, remove
and replace bulb, and reinsert unit into rear of cluster
housing.
OIL PRESSURE INDICATOR
If the light does not come on when the ignition switch
is turned on, or if the light comes on and remains on
after the engine is started, one or more of the following
conditions is indicated:
• Low oil pressure
• High engine temperature
• Defective wiring or switch
Switch Replacement
1.
Disconnect wiring harness connector from sender
unit terminal (located in block above starter on
L-6 engines and at left front of distributor on V-8
engines).
2.
Remove sender unit, replace with new unit, and
; check operation.
GENERATOR INDICATOR
1.
Ignition on, engine not running and telltale light off.
a. Indicator bulb burned out, replace bulb.
b.
Open circuit or loose connection in the telltale
light circuit.
2.
Telltale light stays on after engine is started.
a. If indicator light does not go out at engine idle
speed, refer to Charging Systems under Engine
Electrical, Section 6Y.
TEMPERATURE (COOLING SYSTEM) INDICATOR
The temperature indicator circuit consists of two re-
motely located units, indicator gauge and engine sender
unit. The indicator gauge on all models uses a single
red light to indicate an overheated engine condition.
Engine Sender Unit Replacement
1.
Drain engine cooling system to a level below unit.
2.
Remove sender unit (located in the inlet manifold
near water pump housing on V-8 engines and in the
cylinder head near an exhaust port on L-6 engines)
and replace with new unit.
3.
Refill cooling system and check operation of unit.
CORVETTE INSTRUMENTS AND GAUGES
INDEX
Page
General Description ., 12-34
Service Operations . 12-35
Instrument Cluster ., 12-35
Fuel Gauge 12-35
Speedometer/Tachometer Service. 12-35
Temperature Gauge 12-35
Ammeter/Oil Pressure Gauges 12-35
GENERAL DESCRIPTION
All Corvette instruments and gauges are conveniently
located in the dash-mounted cluster. The entire cluster
is removable to permit servicing of the various instru-
ments and gauges. The indicator and cluster illuminating
bulbs may be replaced without removing the cluster from
the panel.
Regular maintenance is not required on the instrument
cluster or its components other than maintaining clean
and keeping the speedometer and tachometer cables
properly lubricated.
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-35
SERVICE OPERATIONS
INSTRUMENT CLUSTER
REMOVAL AND INSTALLATION (Fig. 49)
1.
Remove mast jacket assembly. Refer to Section 9
for removal procedures.
2.
Disconnect tachometer drive cable at distributor.
3.
Disconnect the headlamp panel control switch from
instrument cluster.
4.
Remove lighting switch as outlined in this section.
10 10-A 1112 13
14
15 16 17 18 19
Fig.
49- Instrument Cluster Connections
1.
Cluster Illuminating
Bulbs
2.
Direction Signal Indicator
Bulb L.H.
3. Direction Signal Indicator
BulbR.H.
4.
Headlamp Actuating Motor
Indicator
5. Headlamp Hi Beam
Indicator
6. Parking Brake Alarm
Indicator
7. Ground Lead Attaching
Point
8. Temperature Indicator
"1"
Terminal
9.
10.
10A.
11.
12.
13.
14.
]5.
16.
17.
18.
19.
20.
21.
Temperature Indicator "S"
Terminal
Ignition Switch Receptacle
ignition Switch Illuminating
Bulb
Oil Pressure Indicator
Tachometer
Lighter Receptacle
Trip Odometer
Wiper Switch Receptacle
Speedometer
Ammeter "Gen" Terminal
Ammeter "Battery" Terminal
Lighting Switch Receptacle
Fuel Gauge
"1"
Terminal
Fuel Gauge "S" Terminal
5. Remove the ignition switch. Refer to Section 6Y
for removal procedure. Then disconnect ignition
switch lamp support at instrument panel.
6. Disconnect oil pressure line at oil pressure gauge
then remove the lead wires from ammeter, wiper
switch and cigarette lighter. Disconnect trip odom-
eter at mast jacket support.
7. Remove the instrument cluster-to-dash retaining
screws and pull cluster assembly slightly forward
to obtain clearance for removal of speedometer
cable, tachometer cable, cluster ground wire, fuel
gauge lead wires and remaining indicator and cluster
illuminating lamps.
8. To install cluster in dash panel, reverse removal
procedure.
FUEL GAUGE
The gasoline fuel gauge circuit consists of an electri-
cal indicator in the instrument cluster and a float-
controlled rheostat in the fuel tank.
Since the fuel gauge consists of two remotely located
units and connecting wires, it is sometimes difficult to
determine which unit is at fault when the gauge fails to
operate properly. Cluster removal is necessary to re-
place the fuel gauge.
NOTE:
Be sure to check gas gauge fuse in fuse
panel before attempting to trouble shoot for
inoperative gauge or tank sending unit.
SPEEDOMETER AND/OR TACHOMETER
Removal and Installation
Cluster must be removed from vehicle to service
speedometer head assembly (see Cluster Removal pro-
cedure)
.
With cluster removed from vehicle:
1.
Remove five screws securing cluster back panel to
cluster assembly; separate the parts carefully.
CAUTION: Care must be used to avoid marring
instrument cluster face.
2.
Remove two screws securing speedometer or ta-
chometer head to cluster back panel; carefully re-
move speedometer or tachometer head.
NOTE:
Servicing of speedometer or tachom-
eter head should be performed by an authorized
AC service station.
3.
Reverse above procedure to install speedometer.
Cable Replacement or Lubrication
1.
Disconnect the. cable from the speedometer or ta-
chometer head. Remove the old cable by pulling it
out from speedometer end of conduit.
NOTE:
If old cable is broken it may be nec-
essary to remove lower piece from transmission
or distributor end of conduit as applicable.
2.
Lubricate the lower 3/4 of cable with
AC
speedom-
eter cable lubricant and push the cable into the con-
duit. Connect the upper end to the speedometer or
tachometer head and road test vehicle for proper
operation.
TEMPERATURE GAUGE
The temperature indicator requires very little service
other than testing for malfunctioning and replacing de-
fective units. Cluster must be removed to service tem-
perature gauge.
Do not attempt to repair either the engine unit or the
gauge. When installing new engine unit, do not use
thread compound on unit threads, as this will increase
electrical resistance of unit and cause faulty reading
on gauge.
AMMETER OR OIL PRESSURE GAUGE
The ammeter or oil pressure gauge requires very
little attention other than keeping ammeter terminals
clean and tight. If the oil pressure control line should
become restricted it should be blown out or replaced.
Cluster must be removed to service these gauges.
HftVKI MANUAL
ELECTRICAL-BODY
AND
CHASSIS
12-36
CAMARO INSTRUMENTS AND GAUGES
INDEX
Page
General Description
12-36
Service Operations
12-36
Instrument Cluster
. . . 12-36
Instrument Lamps
12-36
Printed Circuit
12-36
Fuel Gauge
12-37
Tachometer
. . 12-37
Seat Separator Instrument Console
12-37
Page
Fuel Gauge
12-37
Ammeter
12-37
Temperature Gauge
12-37
Oil Pressure Gauge
. 12-37
Fuel Warning Unit
12-37
Clock.
... 12-37
Oil Pressure Indicator
12-37
Generator Indicator
12-38
Temperature Indicator
12-38
GENERAL DESCRIPTION
The standard Camaro instrument cluster assembly con-
sists
of two
circular units which house
the
speedometer
and fuel gauge assemblies.
The oil
pressure, left-hand
directional
and
brake warning indicators
are
located
in
the face
of the
speedometer bezel while generator,
tem-
perature
and
right-hand directional indicators are grouped
with
the
fuel gauge unit.
The
high beam indicator
is
located between
the
cluster bezels.
A special instrumentation package
is
available with
the
eight-cylinder engine
and
center floor console combina-
tion.
The
special cluster includes:
a
clock; coolant
temperature,
oil
pressure, fuel
and
ammeter gauges,
mounted forward
on the
seat separator console;
a ta-
chometer
in the
right circular housing
of the
dash
in-
strument cluster; and
a low
fuel level indicator replacing
the
oil
pressure indicator lamp
in the
instrument cluster.
The instruments
and
gauges,
may be
serviced only
after
the
instrument cluster
is
removed from
the
vehicle.
Indicator
and
cluster lamps except
for the
high beam
indicator
may be
replaced without removing
the
cluster
assembly. Partial cluster removal
is
necessary when
replacing
the
high beam indicator due
to its
proximity
to
the upper brace
rod
anchor plate.
The
bulbs
are in-
stalled
in
plastic sockets which lock into
the
cluster
housing and make contact with
the
printed circuit.
A
low
level fuel warning system
is a
special feature
available with
the
floor console gauge pack. This
sys-
tem includes
an
indicator lamp
in the
dash cluster and
a
semi-conductor unit senses
the
change
in
electrical
re-
sistance
of the
fuel system circuitry
as
variations
in
fuel level occur.
The
sensing device
is
replaced
as a
unit
if
found defective.
The brake warning light serves
a
dual purpose.
It
functions
as an
indicator when
the
parking brake
is ap-
plied
and
also
if
there
is a
malfunction (loss
of
hydraulic
pressure)
in the
brake system. Switches which provide
the signal
to
operate
the
light
are
located
at the
parking
brake assembly
and at the
brake master cylinder
in the
hydraulic lines. Service
of the
brake pressure differ-
ential switch unit
is
covered
in
Section
5 of
this manual.
Regular maintenance
is not
required on
the
instrument
cluster
or its
components other than maintaining clean,
tight electrical connections, replacing defective parts
and keeping
the
speedometer properly lubricated.
SERVICE OPERATIONS
INSTRUMENT CLUSTER (Figs.
50
thru
53)
Removal
and
Installation
1.
Disconnect battery ground cable.
2.
Remove mast jacket lower support screws
at toe
pan.
3.
Remove mast jacket upper support bolts
and
allow
steering wheel
to
rest
on
seat cushion.
CAUTION: Both supports must
be
detached
to
prevent distortion
of
mast jacket.
4.
Remove cluster attaching screws from face
of
panel
and partially remove assembly from console opening.
5. Reaching behind cluster assembly, disconnect speed-
ometer cable, speed warning device
(if so
equipped
-
Fig.
51) and
chassis harness connector
at
rear
of
panel.
6. Remove assembly from console opening to
a
suitable
bench area
for
required service operations.
7.
To
install, reverse removal procedure.
INSTRUMENT CLUSTER LAMP REPLACEMENT
1.
Turn bulb holder counterclockwise
and
pull
out to
remove from
the
cluster housing.
2.
Pull bulb straight out
to
remove from socket.
3.
Press replacement bulb inward
to
lock
in
socket.
4.
Insert lamp assembly into housing, with lugs
on
holder entering notches
in
housing,
and
turn clock-
wise
to
lock
in
place.
PRINTED CIRCUIT REPLACEMENT
1.
Remove instrument cluster
as
previously described
in this section.
2.
Remove
all
cluster illuminating and indicator lamps
from housing.
3.
Remove fuel gauge terminal nuts
or
tachometer
re-
taining nuts securing printed circuit
to
housing.
4.
Remove four
hex
head screws retaining printed
cir-
cuit
to the
cluster housing
and
remove circuit from
housing.
5.
To
install, reverse removal procedure.
CAUTION:
The
retaining screws
are
part
of
the grounding circuit
and
must
be
installed
to
provide proper connections
for the
printed
eir-
cuit.
CHEVROLET CHASSIS SERVICE MANUAL