
ELECTRICAL-BODY AND CHASSIS 12-15
Fig.
21 - Qlal Quadrant Assembly ~ Camaro
SEAT SEPARATOR CONSOLE LAMPS
COMPARTMENT LAMP REPLACEMENT (Fig.
22)
1.
Remove (pry up) switch assembly from console open-
ing in.the instrument compartment.
2.
Remove bulb from the socket.
3.
Replace bulb and install switch assembly in console
opening.
COURTESY LAMP REPLACEMENT (Fig. 22)
1.
Remove two screws and lens at rear of console.
2.
Remove bulb from retainer.
3.
Replace the bulb, position the lens and install attach-
ing screws.
QUADRANT LAMP REPLACEMENT (Fig. 22)
1.
Remove Dial Quadrant Trim plate retaining screws
and lift trim plate assembly from console opening.
2.
Disconnect lamp socket from the retainer and re-
move bulb from the socket.
3.
To install, insert bulb into the socket and snap the
socket assembly into the retainer.
Position the trim plate assembly into the console
opening and install the retaining screws.
4.
LIGHTING SWITCH REPLACEMENT (Fig. 24)
1.
Disconnect battery ground cable.
2.
Pull control knob out of headlamp ON position.
3.
Reach under instrument panel and depress the switch
shaft retainer (Fig. 25) and remove knob and shaft
assembly.
4.
Remove ferrule nut using Tool J-21932 and remove
switch assembly from instrument panel.
NOTE:
Some Chevelle models require use of
ToolJ-4880.
5. Disconnect the multi-plug connector from the lighting
switch. A screw driver may be inserted in the side
of the switch to pry the connector from the switch.
6. Connect the multi-plug connector to the replacement
switch (Fig. 23). Connect battery cable to battery
terminal and check operation of the light switch'in all
positions.
NOTE:
Ground switch- to check dome lamp
operation.
7. Position switch and bezel to panel mounting hole and
install ferrule jmt.
8. Insert switch control knob and shaft assembly into
switch until retainer engages shaft.
WIPER SWITCH REPLACEMENT (Fig. 26)
1.
Disconnect battery ground cable.
2.
Remove the connectors from the rear of the switch.
NOTE:
On Air Conditioned models it is nec-
essary to remove left A/C outlet duct for acces-
sibility to rear of switch.
3.
Loosen set screw and pull knob from switch shaft.
4.
Remove retaining nuts using special Tool J-21932
and withdraw wiper switch from behind console.
NOTE:
Some Chevelle models require special
ToolJ-4880.
5. To install, reverse removal procedure and check
operation of wipers.
STOPLIGHT SWITCH REPLACEMENT (Fig. 27)
1.
Disengage retaining fingers, disconnect wiring har-
ness connector from switch and unscrew switch from
mounting clip.
2.
Depress brake pedal and push new switch into clip
until shoulder bottoms out against clip.
3.
Check switch position for proper operation. Elec-
trical contact should be made when the brake pedal is
depressed 3/8" to 5/8" from fully released position.
DIMMER SWITCH REPLACEMENT (Fig. 28)
1.
Fold back upper left corner of front floor mat, disen-
gage connector lock fingers, and disconnect multi-
plug connector from dimmer switch.
2.
Remove two screws retaining dimmer switch to toe
pan.
3.
Connect multi-plug connector to new switch and
check operation. Install new switch to toe pan with
two screws. Replace floor mat.
BACKING LAMP SWITCH REPLACEMENT
Located on Mast Jacket (Fig. 29)
1.
Disconnect wiring connector at switch terminals.
2.
Remove switch attaching screws and switch from
mast jacket.
3.
Position new switch to mast jacket, install the re-
taining screws and connect wire connector to switch.
NOTE:
Position gear shift in neutral before
assembling switch to mast jacket.
4.
Check operation of switch.
Located on Transmission (Fig. 30)
1.
Raise and support vehicle.
CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-16
BACK-UP LAMP CONN.
CONSOLE CTSY
LAMP CONN
CLOCK CONN
NEUTRAL SAFETY SWITCH
Fig.
22 - AutoTrans — Seat- Separator Wiring — Chevelle
TAIL
PANEL Ll<
J
TAIL
LIGHTS ^^g
9
""TUtflll -^ ""
DOME
LIGHT
r
•I
m
/
LIGHTS
FUSE HEADLIGHTS
9R
jl PARKING LIGHTS
*^ R ATTPRY
Fig.
23 - Light Switch Terminal Connections
Fig.
24 - Light Switch and Cigarette
Lighter Installation
CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-17
Fig.
25 - Shaft Retainer
2.
Disconnect switch wiring from harness wiring at
in-line connector.
3.
Remove bolt retaining wiring attaching clip to
transmission. *
• '
•
4.
Remove wire clip retaining reverse lever rod to
switch.
5. Remove screws retaining switch and shield assembly
to transmission, remove switch.
NOTE:
Do not remove transmission-to-bracket
retaining bolts.
6. To install, reverse removal procedure and check
switch for operation in transmission reverse range.
.38-.64"
VIEW A
Fig.-27 - Stoplight Switch Assembly
NEUTRAL SAFETY SWITCH REPLACEMENT
Column Shift (Fig. 31)
1.
Disconnect wiring harness connectors at switch ter-
minals..
2.
Remove switch retaining screws and switch from
mast jacket.
3.
To install, position shift lever in drive and locate
lever tang against transmission selector plate.
4.
Align slot in contact support with hole in switch and
insert pin (3/32" dia.) to hold support in place.
Switch is now in drive position.
5. Place contact support drive slot over shifter tube
drive tang and tighten screws. Remove clamp and
pin.
6. Connect wiring harness to switch terminals and
check operation of switch.
Floor Shift
Chevrolet, Chevelle, Chevy II and Camaro
(Fig.
31)
1.
Position shift lever in drive position. Remove ash
Fig.
26 - Windshield Wiper Switch
Fig.
28 - Dimmer Switch
CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-18
TO BACK UP
LAMP SWITCH
TO STOP LAMP
SWITCH
Fig.
29 - Backing Lamp Switch on Mast Jacket (Chevelle)
tray, trim plate assembly, and indicator lens and
housing from console.
Disconnect bulbs from housing. Disconnect multiple
connector at switch terminals or on Camaro models
from the wiring harness at the in-line connector.
Remove switch retaining nuts and switch.
Tp install new switch, clamp pawl rod against contact
point "B" of detent and align slot in contact support
6.
7.
with drive hole in switch and insert a pin (3/32" dia.)
to hold in place. Switch is now in drive position.
Position switch to lever and bracket assembly with
lever engaged in contact support and install retaining
nuts.
Remove clamp and pin, connect wiring and check op-
eration of switch.
Install indicator lamps, housing, lens, ash tray and
trim plate assembly.
Corvette {Fig. 32)
1.
Disconnect shift control lever arm from the control
rod.
2.
Remove the shift control knob.
3.
Remove Trim Plate retaining screws and trim plate
assembly.
4.
Remove control assembly retaining screws.
5. Remove control assembly from the seal and cut
switch wiring.
6. Remove switch retaining nuts and switch from, the
control assembly.
7. To install, position gearshift in "Drive" position
align hole in contact support with hole in switch and
insert pin (3/32" dia.) to hold support in place.
8. Place the contact support drive slot over the drive
tang and tighten switch mounting screws.
9. Splice wiring harness to switch wiring.
10.
Install trim plate assembly and shift lever control
knob.
11.
Connect shift lever arm to the transmission control
Fig.
30 - Backing Lamp Switch on Transmission
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 12-21
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

10
27
18
1.
To R. H. Door Jamb Switch
2.
To Inst. Pane! Compt. Light
3. To Heater Control
4. Heater Control Lamp
5. To Ignition Switch
6. To Seat Separator Harness Conn.
7. Inst. Cluster Conn.
8. To Directional Signal Conn.
9.
Door Jamb Switch to Light Switch Conn,
Fig.
40 - Instrument Panel Wiring
10.
To Wiper Switch
11.
To Light Switch Conn.
12.
To Gen. and Fwd. LP. Harness Asm,
13.
To Light Switch
14.
Courtesy Lamp
15.
To Dome Lamp Conn.
16.
ToL.H. Door Jam Switch
17.
Gen. and Fwd Harness Conn.
18.
To Paricing Brake Alarm Switch
19.
To Rear Door Jamb Switch
20.
To Fisher Body Conn.
21.
To Stop Lamp Switch
22.
To Back-Up Lamp Switch
23.
To Directional Signal Flasher
24.
To Cigarette Lighter
25.
To Heater Resistor
26.
Directional Signal Flasher
27.
Door Jamb Switch