ELECTRICAL-BODY AND CHASSIS 12-8
is inserted through radiator support opening.
Remove two screws retaining lamp assembly to
lower sheet metal.
Remove three screws retaining lamp assembly to
lender.
To replace lamp assembly, reverse removal proce-
dure and check operation of the unit.
is aligned with flat on pivot shaft. Install stop lock
bolt and torque bolt to 45-60 in, lbs. Make sure that
side-to-side panel alignment is not changed when in-
stalling and tightening the stop.
CAUTION: Do not exceed specified torque
when tightening stop lock bolt.
HEADLAMP PANEL REPLACEMENT-CORVETTE
Refer to Figure 13 for Panel Mounting details.
1.
Remove engine compartment hood as outlined in
Section 1.
2.
Actuate headlamp panel to the open position.
NOTE:
In the event headlamp motor is inop-
erative, manual positioning of the panel can be
accomplished by turning the knurled knob at in-
board end of motor. As an assist in manual
operation of panel, apply light hand pressure to
panel in desired direction of rotation.
3.
Remove positive lead from battery terminal.
4.
Remove headlamp bezel retaining screws and bezel.
5. Remove the sealed beam housing unit as an assem-
bly - disconnect sealed beam leads at harness con-
nector and remove connector from sealed beam
leads;
remove the housing-to-panel retaining screws
and remove housing unit and wiring from panel.
6. Remove motor from panel pivot shaft - see motor
removal procedure. Then remove the panel stop
from panel inboard pivot shaft, and disconnect switch
lead wires from panel, support-mounted motor
switch.
7. Remove the panel retaining bolt access hole plugs
from inside the panel then rotate panel as required
and remove the retaining bolts and slide supports
from ends of panel pivot shaft. Remove bearing, felt
seal, retainer and washer from inboard pivot shaft.
8. Remove panel from its location by alternately disen-
gaging pivots from their retaining slots and with-
drawing unit forward through opening in body (fig.
14).
9. Loosen alien screw in spacer and disassemble parts
from the panel outboard pivot shaft.
10.
Install washer, retainer, felt seal, bearing and
spacer, in that order, to panel outboard pivot shaft.
Do not tighten spacer on shaft at this time.
11.
Position panel in body opening and index panel pivot
shafts in retaining slots; then loosely install support
retaining bolts.
12.
Install washer, retainer, felt seal, bearing and sup-
port, in that order, to panel inboard pivot shaft, and
loosely install support retaining bolts. -
13.
Check side-to-side alignment of panel, making sure
that there is no panel-to-body contact; position
spacer snugly against bearing; then tighten spacer
seat screw to 30-50 in. lbs.
14.
Install stop on panel inboard shaft so that it rests
against bearing, being sure that index mark on stop
15.
Check and align panel to body as follows:
a. Tighten panel pivot support bolts snugly but still
allowing panel to" be moved by applying hand
pressure.
b.
Position panel to the closed position and align
with body so that all surfaces are flush.
c. With the panel in the closed position the outboard
access hole is aligned with the forward bolt head.
Tighten this bolt with the panel in the closed
position - access to bolt head can be obtained by
working through opening between the hood and
body.
d. Rotate panel to obtain access to each bolt head
and torque bolts to 100-140 in. lbs.
e. Connect switch lead wires to support-mounted
limit switch.
16.
Install seaLed beam housing unit and at the same time
position sealed beam lead wires through panel out-
board pivot shaft. Install housing unit retaining
screws and install lead wires in connector, making
sure to match colors between harness and connector.
17.
Install motor assembly - see motor replacement
procedure.
18.
Connect positive lead to battery terminal.
19.
Adjust headlamp panel as outlined under "Headlamp
Panel Travel Adjustment".
20.
Adjust headlamp aiming as outlined under "Headlamp
Adjustment".
21.
Install headlamp bezel and engine compartment
hood - refer to Section 1 for hood installation.
Fig.
14
- Headlamp Panel Removal (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-9
Fig.
15 - Headlamp Panel Actuating Motor Mounting (Corvette)'
HEADLAMP PANEL MOTOR-CORVETTE (Fig. 15)
Removal
1.
Raise hood and as a safety precaution install a bolt
through the hole in the hood support - secure bolt
with a nut.
2.
Remove positive lead from battery terminal.
3.
Disconnect motor lead wire and position it out of the
way.
4.
Turn the knurled knob at inboard end of motor until
the gear seems to turrj freely - turn the knob in one
direction until a definite drag is experienced, then
rotate knob approximately six complete turns in the
opposite direction.
NOTE:
The above step is necessary to produce
a no-load condition on the drive gear and to per-
mit separation of motor from the panel pivot
shaft.
5. Remove the retainer from groove in motor locating
stud then remove the motor-to-support retaining
screw and remove motor assembly from the vehicle.
Installation
1.
Rotate motor and headlamp panel as required to align
slot in motor with headlamp panel pivot shaft, and
install motor on shaft so that the bracket is aligned
with the locating stud.
NOTE:
It may be necessary to turn knurled
knob on end of motor to permit alignment of
motor with shaft.
Slide motor onto shaft until it seats against shaft
shoulder; then install retainer in groove on locating
stud.
Install motor-to-support retaining screw making
sure ground wire is installed between screw head and
bracket.
Connect motor lead wires, making sure that contacts
are clean and that connection is secure.
Connect positive lead battery terminal, remove bolt
from hood support, close hood and check operation of
headlamp panel.
HEADLAMP MOTOR REPLACEMENT-
CAMARO (Fig. 16)
1.
Disconnect battery ground cable and when working on
right headlamp unit, remove battery from vehicle to
gain access to housing retaining bolts.
2.
Remove bezel retaining screws and bezel.
3.
Remove headlamp cover retaining screws and cover
from door assembly.
4.
Manually open door assembly (push door toward cen-
ter of vehicle) and disconnect limit switch
connections.
5. Remove four screws retaining assembly to radiator
support (note location and number of shims, if any).
6. Rotate assembly toward center of vehicle until rear
of unit is exposed, then disconnect wiring connectors
at headlamp and motor assemblies.
7. Rotate assembly until headlamp is facing downward
and carefully remove the assembly from the vehicle
opening.
8. Remove nut attaching motor assembly to pivot arm.
9. Remove two nuts and bolts retaining motor assembly
to base plate and remove motor assembly.
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-19
VIEW A
•CONTACT SUPPORT
DRIVE SLOT IN LINE
WITH HOLE IN SWITCH
PAWL
CONTACT POINT B
CONTACT SUPPORT
DRIVE SLOT IN LINE
WITH HOLE IN SWITCH
FLOOR SHIFT
(EXCEPT CAMARO)
COLUMN SH
Fig.
31 - Neutral Safety Switches
PARKING BRAKE ALARM SWITCH REPLACEMENT
Corvette (Fig. 33)
1.
Remove seat belt retainer and parking brake cover
assembly from center console.
2.
Disconnect wire from brake alarm switch.
3.
Remove retaining screw and switch from
reinforcement.
4.
Position new switch to reinforcement and install re-
taining screw.
5. Connect switch wire and check operation of switch.
6. Install cover and seat belt retainer assembly.
Chevrolet, Chevelle, Chevy II and Camaro (Fig. 34)
1.
Disconnect wiring connector at switch terminal.
2.
Remove nut and lock washer or retaining bolt and
disengage switch from brace.
3.
To install, reverse removal procedure.
INSTRUMENT PANEL COMPARTMENT
LAMP/SWITCH REPLACEMENT
1.
Disconnect battery ground cable.
2.
Reach into glove box, depress bulb in end of switch
and turn counterclockwise to remove bulb.
3..
Remove switch from socket. Carefully detach wire
and terminal from switch.
NOTE:
On some model switches, the wire and
terminal cannot be detached from the switch
making it necessary to cut and splice the switch
wire.
4.
Insert wire and terminal into new switch.
5. Push switch into place and install bulb by setting it in
place, depressing and turning it clockwise.
CIGARETTE LIGHTER REPLACEMENT
Chevrolet, Chevy II, Camaro and Corvette (Fig. 23)
1.
Disconnect battery ground cable.
2.
Disconnect wire connector at rear of lighter unit
under dash.
3.
Remove retainer from rear of housing assembly and
disengage lighter unit from panel.
4.
To install, reverse removal procedure.
Chevelle (Fig. 35)
1.
Disconnect battery ground cable.
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 12-29
Fig.
43b - Speed Warning Device
TEMPERATURE AND/OR OIL PRESSURE
GAUGE
1.
Disconnect battery ground cable.
2.
Remove ash tray and ash tray retainer.
3.
Disconnect A/C hose from the distributor duct.
4.
Disconnect wiring connectors and lamp bulbs from
rear of gauge.
5. Disconnect oil pressure pipe fitting from rear of oil
pressure gauge.
6. Remove (3) screws retaining gauge assembly to
cluster cover and disengage unit from cover.
7. Remove (4) retaining nuts and remove gauge from
template.
8. To install, reverse removal procedure.
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 the following condi-
tions is indicated:
• Low oil pressure
• Defective wiring or switch
• High engine temperature
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 using Tool J-21757, replace with
new unit, and check operation.
GENERATOR INDICATOR
Ignition on, Engine not Running and
Telltale Light Off
1.
Indicator bulb burned out, replace bulb.
2.
Open circuit or loose connection in the telltale light
circuit.
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 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.
CHEVROLET CHASSIS SERVICE MANUAL
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 12-37
Fig.
50 - Instrument Cluster Installation — Camaro
FUEL GAUGE REPLACEMENT
1.
Remove instrument cluster assembly as previously
described.
2.
Remove cluster lamps from gauge cover plate,
ground screw and terminal nuts attaching printed
circuit to fuel gauge.
3.
Remove three screws retaining gauge assembly to
cluster housing.
4.
Carefully move printed circuit away from gauge and
remove gauge assembly from cluster housing.
5. Remove terminal nuts securing gauge to cover plate,
and detach gauge unit.
6. To install, reverse removal procedure.
TACHOMETER
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.
Remove cluster lamps from rear of gauge cover and
disconnect harness wiring connections from gauge
terminals.
3.
Remove three screws retaining gauge to cluster
housing.
4.
Move printed circuit away from gauge area and re-
move gauge unit from housing.
5. Remove terminal nuts securing gauge to cover
detach unit.
6. To install, reverse removal procedure.
SEAT SEPARATOR INSTRUMENT CONSOLE
(Fig.
54)
(Fuel,
Ammeter, Temperature, Oil Pressure Gauges,
Low Fuel Warning Unit, and Clock)
1.
Disconnect battery ground cable.
2.
Remove clock shaft knob from face of cluster.
3.
Remove cover retaining screws (4) and cover from
cluster assembly.
NOTE:
Use an alien wrench to remove the two
screws located in the top of the cover below the
instrument console.
4.
Remove four screws retaining gauge mounting plate
to cluster housing.
5. Carefully disengage gauge plate from housing and
disconnect oil pipe and all electrical connections at
rear of gauges.
NOTE:
At this point, with gauge package re-
moval from housing all gauges including the low
fuel warning system may easily be serviced.
6. To install assembly, use reverse of 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
conditions is indicated.
• Low oil pressure
• Defective wiring or switch
Sending Unit 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).
Fig.
51 - Speed Warning Device
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-42
Fig.
57 - Tilt Steering Column
12.
Remove upper support bracket bolts and bracket
assembly.
CAUTION: Do not suspend column by lower
reinforcement only.
Reinforce column and remove wiring harness pro-
tector and clip, then position bracket and reinstall
bolts (finger tight).
13.
Remove shift lever bowl from mast jacket and dis-
engage from wiring harness.
14.
Remove three mounting screws from engagement
with lockplate. Use care not to lose 3 springs as
screws are removed.
15.
Disassemble switch and upper bearing housing from
switch cover.
NOTE:
Directional switch is not repairable
and must be replaced.
16.
Insert the upper bearing housing assembly and signal
switch assembly into, the cover, feeding the signal
switch wires through the. cover.
17.
Align signal switch and bearing housing holes with
holes in the cover. Install three mounting screws
through the holes.
18.
Slide three springs on to screws and place lockplate
in position over screws and springs. Tighten screws
three turns into lockplate.
19.
Feed switch wire through the shift lever bowl and
place upper end assembly on top of bowl.
20.
Place shift lever bowl and signal switch assembly
on top of jacket, aligning the tangs on the I.D. of the
lockplate with slots in jacket. Lock upper end of
assembly into position by pushing down on cover
assembly and rotating fully clockwise.
21.
Tighten 3 turn signal mounting screws.
22.
Remove mast jacket support clamp, position wiring
and install wiring cover and clip, then reinstall mast
jacket mounting bracket assembly.
Fig.
58 - Telescoping Column
CHEVROLET CHASSIS SERVICE MANUAL