1967 CHEVROLET CAMARO Engine wiring

ENGINE-ELECTRICAL 6Y-32

STARTER CIRCUIT

INDEX

Page

General Description 6Y-32

Maintenance and Adjustments . '. . 6Y-32

Resistance Checks 6Y-32

Starting Motor and Solenoid Check 6Y-33
Page

Service Operations 6Y-33

Starter Motor 6Y-33

Removal and Installation 6Y-33

GENERAL DESCRIPTION

The function of the starting system, composed of the

starting motor, solenoid and battery, is to crank the

engine. The battery supplies the electrical energy, the

solenoid completes the circuit to the starting motor, and

the motor then does the actual work of cranking the

engine.

The starting motor (fig. Is) consists primarily of the

drive mechanism, frame, armature, brushes, and field

windings. The starting motor is a pad mounted 12-volt

extruded frame type, having four pole shoes and four
fields,
connected with the armature. The aluminum drive

end housing is extended to enclose the entire shift lever

and plunger mechanism, protecting them from dirt,

splash, and icing. The flange mounted solenoid switch

operates the overrunning clutch drive by means of a

linkage to the shaft lever.

The V-8 wiring harness differs from the in-line engine

in that the ignition lead to the coil from the switch is at-

tached at the coil instead of at the starter solenoid (fig.

2s).

CONTACT

FINGER

PINION

STOP

BRUSH

INSULATED BRUSH HOLDER \ FIELD COIL

BRUSH SPRING ARMATURE

GROUNDED BRUSH HOLDER
OVERRUNNING

CLUTCH

Fig.
Is—Starting Motor Cross Section (Typical)

MAINTENANCE AND ADJUSTMENTS

No periodic lubrication of the starting motor or sole-

noid is required. Since the starting motor and brushes

cannot be inspected without disassembling the unit, no.

service is required on these units between overhaul

periods.

RESISTANCE CHECKS

Although the starting motor cannot be checked against
specifications on the car, a check can be made for. exces-

sive resistance in the starting circuit. Place a volt-

meter across points in the cranking circuit as outlined

below and observe the reading with the starting switch

closed and the motor cranking (distributor primary lead

grounded to prevent engine firing).

1.
From battery positive post To solenoid battery

terminal.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-13

PULL-IN

WINDING
li
HOLD-IN

WINDING

Fig.
4B -
Overdrive Electrical Circuit Wiring Diagram

ELECTRICAL

Any one of the following general complaints may be due

to electrical trouble in the overdrive circuit.

1.
Does not engage.

2.
Does not release.

3.
Does not kickdown from overdrive.

These troubles may be traced and remedied as de-

scribed in the following paragraphs.

1.
Does not engage

a. With the ignition switch on, ground the "KD" ter-

minal of the solenoid relay with a jumper lead.

If the solenoid clicks, the relay and solenoid cir-

cuits are in operating condition. If no click is

heard in the relay, check the fuse and replace if

defective.

b.
If the fuse is good, use a second jumper lead to

connect the "SOL" and "BAT" terminals of the

relay. If a click is now heard in the solenoid, the

relay is probably at fault and should be repaired

or replaced.

c. If the solenoid does not click in Step b, check the

wiring to the No. 4 terminal of the solenoid and

replace if necessary. If the wiring is not defec-

tive,
the trouble is probably in the solenoid. Re-

move the solenoid cover, examine the solenoid

contacts in series with the pull-in winding and

clean if necessary. Test again for clicks, as in

Step b, after replacing solenoid cover and lead

wires.
Replace the solenoid if trouble has not

been corrected.

d. If the relay and solenoid circuits are in good con-

dition as determined in Step a, leave the ignition

switch on and make sure the manual control knob

is in the overdrive position. Ground one and then

the other of the two terminals next to the stem of

the kickdown switch (identified as "SW" and
?fREL"). K the solenoid clicks when one terminal

is grounded but not the other, replace the switch.

If the solenoid does not click when either of the

terminals is grounded, check the wiring between

the relay and the kickdown switch and replace if

defective.

e. If the solenoid clicks as each terminal is grounded

in Step d, ground the governor switch terminal.

If the solenoid clicks, the governor switch may be

defective. If the solenoid does not click, check

the wiring between the kickdown and governor

switches and replace if necessary.

2.
Does not release

a. Remove the connection to the "KD" terminal of

the relay. If this release overdrive, look for a

grounded control circuit between the relay and

governor switch.

b.
If the overdrive is not released in Step a, dis-

connect the lead to the "SOL" terminal of relay.

If this releases the overdrive, replace the relay.

3.
Does not kickdown from overdrive

a. With the engine running, connect a jumper lead

between the No. 6 terminal of the solenoid and

ground. Operate the kickdown switch by hand.

This should stop the engine. If it does, the sole-

noid is probably defective and it should be checked

for dirty ground-out contacts or other defects

within the ground-out circuit of the solenoid (fig.

4B).
Clean the contacts or replace the contact

plate as required.

b.
If the engine does not stop in Step a, ground one

and then the other of the two terminals (Identified

as "IGN" and "SOL") farthest from the sfem of

the kickdown switch. The engine should stop when

one of the two terminals (IGN) is grounded. If

the engine does not stop when the terminal is

grounded, the wiring or connections to the switch

between the switch and coil are defective. When

the btlier terminal (SOL) is grounded, the engine

should stop when the kickdown switch is operated.

If the engine does not stop when the kickdown

switch is operated with the second terminal

grounded, the kickdown switch is defective. If

the trouble is in the kickdown switch, adjust the

linkage to give more travel of the switch rod.

If this does not correct the trouble, replace the

kickdown switch.

If the kickdown switch operates as it should,

check for an open circuit in the wiring between

the kickdown switch and the No. 6 terminal of the

solenoid.

c. If the trouble is not located by the above checks,

the upper contacts of the kickdown switch may not

be opening. To check for this condition, ground

the overdrive control circuit at the governor

switch. This should cause the solenoid to click.

Operate the kickdown switch by hand. This should

cause a second click as the solenoid releases.

If there is no second click, adjust the linkage to

give more travel of the switch rod. If this does

not correct the trouble, replace the kickdown

switch.

CHEVROLET CHASSIS SERVICE MANUAL

STEERING 9-12

1.
Steering Wheel Nut

2i Screw

3. Retaining Ring

4.
Thrust Washer

5. Wave Washer

6. Turn Signal Switch

7. Upper Bearing and

Housing Assembly

8. Cover
Fig.
24—Syncromesh Steering Column—Exploded View

9. Spring

1.0. Lock Ring

11.
Thrust Washer

12.
Shift Lever Spring

13.
Shift Bowl

14.
Shroud

15.
Bearing

16.
Mast Jacket

17.
Flange Plate
18.
Wiring Protector

19.
Shift Tube Assembly

20.
Adapter

21.
Bolt

22.
Reinforcing Ring

23.
Steering Shaft

24.
Bearing

25.
Tolerance Ring Kit

26.
Flange

cover, and seal to dash panel and remove covers.

13.
Corvette only (Fig. 23)

a. Remove clamp bolt and washer from support as-

sembly on engine side of dash panel.

b.
Remove screws securing support assembly and

seal to engine side of dash panel.

14.
Support column and remove screws, nuts, and bolts

securing instrument panel mounting bracket to un-

derside of instrument panel. On Chevrolet, Chevelle,

Camaro, and Chevy II models, remove and retain

wedge shims. On Chevrolet models, remove

retainers.
15.
Move front seat back as far as possible to provide

maximum clearance, and carefully lift column up out

of position and remove from vehicle. If column is

equipped with lower shift levers, mechanic at engine

compartment can pilot levers through dash panel

opening as column is lifted.

Disassembly'—Syncromesh Column (Fig. 24)

1.
Unsnap and remove wiring protector (fig. 25).

CAUTION: Secure column in bench vise for

service one of two ways shown in Figure 26.

Clamping column in vise in any other manner

CHEVROLET CHASSIS SERVICE MANUAL

STEERING 9-29

column mounting bracket, and place bracket in cor-

rect position on underside of instrument panel.

Loosely install bracket using bracket to column

mounting screws and bracket to instrument panel

washers and bolts.

NOTE: Steering shaft to gear clamp must be

tightened before column attaching bolts are

torqued. Refer to "Steering Gear-Chevy n",

installation procedure, for correct Chevy II

steering column alignment procedure.

5.
Camaro only (fig. 60):

Lay wedge shim in position on instrument panel

column mounting bracket and place bracket in cor-

rect position on underside of instrument panel.

Loosely install bracket using bracket to column

mounting screws, nuts, and washer and bolt as shown

in Figure 60.

6. Corvette only (fig. 61):

Loosely secure column mounting bracket to sup-

port plate and instrument panel with washers and

bolts.

7.
Secure flanged end of column to steering coupling

with lockwashers and nuts. On Chevy n, connect col-

umn to steering gear with clamp, clamp bolt, and

nut. On Corvette, slide steering shaft flange into

lower coupling
half,
and install upper clamp bolt

loosely; also secure support, seal and clamp loosely

at dash on engine side.

8. Tighten instrument panel mounting bracket bolts and

nuts.
Refer to torque specifications at rear of manual

for correct torque values.

9. Chevrolet only (fig. 15):

Place upper and lower mast jacket covers in po-

sition and secure covers together and to instrument

panel using nuts and screws as shown in Figure 15.

10.
Chevy H only (fig. 18):

Place lower mast jacket cover in position under

mast jacket and secure to upper cover with screws.

11.
CheveUe only (fig. 15):

Place mast jacket trim cover in position over col-

Fig.
61—Instrument Panel Mounting Bracket and

Support Plqte—Corvette
umn on underside of instrument panel and secure

with screws.

12.
Corvette only (fig. 14):

Slide escutcheon into position at instrument panel

and secure with screws. Place upper end lower

covers in position and secure with screws.

13.
On Chevrolet and CheveUe models with column

mounted powerglide controls, secure transmission

shift indicator pointer into position with set screw

(fig. 15). ,

14.
Chevrolet only (fig. 19):

a. Secure seal and cover to dash panel with screws.

b.
Place clamp assembly in position and install

clamp screw.

c. Install dash panel trim cover with mounting

screws.

15.
Chevelle only (fig. 20):

a. Secure seal and inner and outer covers to dash

panel with screws.

b.
Secure inner and outer covers together with

screws.

c. Install trim cover to dash panel with two

retainers.

16.
Chevy H only (fig. 21):

a. Secure seal, retainer, and clamp to dash panel

with screws.

b.
Install clamp screw.

c. Slide collar into position. Pinch and staple upper

tabs together.

17.
Camaro only (fig. 22):

a. Secure seal, upper cover, and lower cover to

dash panel with screws.

b.
Secure upper and lower cover together with

screws.

c. Fold rubber boot over securely against dash panel

to conceal covers.

18.
Corvette only (fig. 23):

a. Secure seal and support assembly to dash panel

on engine compartment side.

b.
Tighten clamp, washer, and clamp bolt on engine

compartment side.

19.
Connect transmission linkage to lower shift tube

levers in engine compartment, if column is so

equipped. Adjust levers as outlined in Section 7.

20.
Install steering wheel as outlined in this section.

21.
Connect directional signal, horn, back-up lamp, and

neutral start switch at wiring harness plugs. Adjust

back-up lamp, neutral start switch as outlined in

Section 12.

22.
Adjust steering gear and align and center steering

wheel as outlined in this section.

STEERING LINKAGE (Fig. 62)

TIE RODS

There are two tie rod assemblies used on all models.

Each assembly is of three piece construction, consisting

of a sleeve and two tie rod ends. The ends are threaded

into the sleeve and locked with clamps. Right and left

hand threads are provided to facilitate toe-in adjustment

and steering gear centering.

The tie rod ends are self-adjusting for wear and re-

quire no attention in service other than periodic lubrica-

tion and occasional inspection to see that ball studs are

tight. Replacement of tie rod ends should be made when

CHEVROLET CHASSIS SERVICE MANUAL

STEERING 9-34

Fig.
64-Over Center Adjustment

transmission fluid "Type A" bearing the mark

"AQ-ATF" followed by a number and the suffix

letter "A".

ADJUSTMENTS

POWER STEERING GEAR

Chevrolet, Chevelle, and Camaro

The over-center adjustment (fig. 64) is the only power

steering gear adjustment which can be made on the car.

However, in order to make this adjustment, it is also

necessary to check the combined ball and thrust bearing

preload.

If the vehicle is equipped with a tilt column it will be

necessary to disconnect the steering coupling to obtain a

torque reading of the column. This torque should then be

subtracted from any reading taken on the gear.

1.
Disconnect the pitman arm from the relay rod.

2.
Loosen the pitman shaft adjusting screw loeknut and

thread the adjusting screw out to the limit of its

travel through the side cover. '. •

3.
Disconnect steering column harness at chassis wir-

ing connector plug.

4.
Remove horn button.

5.
Turn the steering wheel through its full travel, then

locate the wheel at its center of travel.

6. Gheck the combined ball and thrust bearing preload

with an inch-pound torque wrench on the steering

shaft nut by rotating through the center of travel

(approximately 1/4 turn in each direction). Note the

highest reading.

7.
Tighten the pitman shaft adjusting screw and check

torque at steering shaft nut until over center preload

and total steering gear preload falls within speci-

fications. Refer to torque specifications at rear of

manual for correct torque values.

8. Install horn button. Connect steering column harness

at wiring connector plug.
Chevy II and Corvette

The steering gear used with power steering is adjusted

in the same manner as the manual steering gear.

PUMP BELT TENSION

1.
Loosen nut on pivot bolt and pump brace adjusting

nut.

CAUTION: Do not move pump by prying against

reservoir or by pulling on filler neck.

2.
Move pump, with belt in place until belt is tensioned

to specifications as indicated by Tool J-7316 (Fig-.

65).

3.
Tighten pump brace adjusting nut. Then tighten pivot

bolt nut.

HYDRAULIC SYSTEM CHECKS

The following procedure outlines methods to identify

and isolate power steering hydraulic circuit difficulties.

This test is divided into two parts. Test number one

provides means of determining whether power steering

system hydraulic parts are actually faulty. If test number

one results in readings indicating faulty hydraulic opera-

tion, test number two will identify the faulty part. Be-

fore performing hydraulic circuit test, carefully check

belt tension and condition of driving pulley. Strand

tension of belt should be 125 lbs. on new belts and 75 lbs.

on old belts, as indicated by Tool J-7316 (Fig. 65).

Test Number One—Oil Circuit Open

Engine must be at normal operating temperature. In-

flate front, tires to correct pressure. All tests are made

with engine idling, so adjust engine idle speed to correct

specifications listed in Section 6 and proceed as follows:

a. With engine not running, disconnect flexible pres-

sure line from pump and install Tool J-5176 as

Fig.
65— Checking Belt Tension with Tool J-7316

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-2

FJg.
1 - Fuse Panel Assembly

All power window and tailgate circuits require the igni-

tion switch to be "ON" to open or close the windows un-

like past model designs which were operated independ-

ently of the ignition switch.

The windshield wiper and washer switch is new in that

washer button in the center of the knob has been deleted
and its function will be accomplished by pushing the knob.

A set screw is used to retain the knob to the shaft.

In addition to fuses, the wiring harness incorporates

fusible links to protect the wiring. Links are used rather

than a fuse in wiring circuits that are not normally fused,

such as the ignition circuit. Fusible links in the Chevro-

let wiring are four gauge sizes smaller than the cable it

is designed to protect. The links are marked on the

insulation with wire gauge size because of the heavy insu-

lation which makes the link appear a heavier gauge than it

actually is.

Engine compartment wiring harness incorporate sev-

eral fusible links. Each link is identified with its gauge

size.
A fusible link is a length of special wire (normally

four wire gauges smaller than the circuit it is protecting)

used in wiring circuits that are not normally fused, such

as the ignition circuit. The same size wire with a spe-

cial hypalon insulation must be used when replacing a

fusible link.

The links are:

1.
The pigtail lead at the battery positive cable (except

Corvette) is a 14 gauge, brown fusible link protecting

the 10 gange battery charging circuit. This wire is

an integral part of the battery cable assembly and

servicing requires replacing the complete battery

cable assembly. On Corvette models this link is

installed as a molded splice at the solenoid "Bat"

terminal and servicing requires splicing in a new

link.

2.
A 16 gauge black fusible link is located at horn relay

to protect all unfused wiring of 12 gauge or larger.

It is a serviceable piece with an in-line connector

and is not integral with the wiring harness.

3.
The generator warning light and field circuitry (16

gauge wire) is protected by a fusible link (20 gauge

orange wire) used in the "battery feed to voltage

regulator #3 terminal" wire. The link is installed

as a molded splice in the generator and forward lamp

harness and is serviced by splicing in a new 20 gauge

wire as required.

4.
The ammeter circuit on all models is protected by

two orange, 20 gauge wire fusible links installed as

molded splices in the circuit at the junction block or

the solenoid "Bat" terminal (Corvette only) and at the

horn relay. Each link is serviced by splicing in a

new 20 gauge wire as required.

The wiring harnesses use a standarized. color code

common to all Chevrolet vehicles. Under the color code,

the color of the wire designates a particular circuit. The

harness title indicates the type of harness, single of mul-

tiple wire, and also describe the location of the harness.

The body harness is a flat, solid wire assembly and is

routed through the vehicle near the center of the body.

Composite wiring diagrams (figs. 104 thru 124) are in-

cluded at the end of this section.

MAINTENANCE AND ADJUSTMENTS

Maintenance of the lighting units and wiring system

consists of an occasional check to see that all wiring

connections are tight and clean, that the lighting units are

tightly mounted to provide good ground and that the head-

lamps are properly adjusted. Loose or corroded con-

nections may cause a discharged battery, difficult start-

ing, dim lights, and possible damage to generator and

regulator. Wire harnesses must be replaced if insulation

becomes burned, cracked, or deteriorated. Whenever it
is necessary to splice a wire or repair one that is bro-

ken, always use solder to bond the splice. Always use

rosin flux solder on electrical connections. Use insulat-

ing tape to cover all splices or bare wires.

When replacing wires, it is important that the correct

size be used. Never replace a wire with one of a smaller

size.

Each harness and wire must be held securely in place

by clips or other holding devices to prevent chafing or

CHEVROLET CHASSIS SERVICE MANUAL

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 12-21

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