1967 CHEVROLET CAMARO brake light

ELECTRICAL-BODY
AND
CHASSIS
12-66

R.H. PARK

&DIR.
SIG. LP

L.H. PARK

& DQU SIG.
LP,
GROUND
TO

FENDER REINF

BRAKE FLUID

ill WARNING SW.

Fig.
109 - Front Lighting and Engine Compartment — (Chevelie)

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY
AND
CHASSIS
12-77

FUEL GAGE

LEGEND

CHEVROLET WRG

—CHEVROLET RPO WRG

DOME LAMP

REAR COMPARTMENT

LAMP (CONVERT.)

PRK BRAKE

ALARM SW

18
W
-

18 OR-

18 T —

18 BRN

BODY CONNECTOR

18 LG ——•

18 DG —

18 Y

18 P

16 B
R.H* TAIL,STOP

&
DIR, SIG.

LAMP (OUTBOARD)

R.H. TAIL, STOP

&DIR.
sia

LAMP ONBOARD)

R.B.
BACK-UP

LAMP

LICENSE LAMP

L.H. BACK-UP

LAMP

L.H,TAIL, STOP

6 DIR. SIG.

LAMP ONBOARD)

L.R. TAIL.STOP

& DIR. SIG. LAMP

(OUTBOARD)

Fig.
120 - Body and Rear Lighting — Corvette

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-80

L.H. DOOR

JAMBSW

— —20Y
20QR
«
«t5§ COMPT LP

RADIO

HEAT .

CONTROL SW

HEAT CONTROL

LIGHT

CJG LIGHTER

14OR

20GY

20GY

•ONLY WIRES

PERTINENT

TO PRODUC-

TION OR NEU-

TRAL SAFETY

HAVE BEEN

SHOWN.

20T—

20P —

20P —

18DBL

20LBL

20T
12PPL

20LBL

20 T

14 OR

16BRN

20DBL

20 W

18LBI

18DBL

20LG

20DG
20 DG

20BRN

20OR

20PPL

14LBL

14OR

48LBL

18B

18DBL

R.H. DOOR

JAMBSW
•INSTRUMENT

CLUSTER

ILLUM <8)

BRAKE ALARM (33-39)

R.H. SIGLAMP(15)

GEN WARN. LAMP (25-39)

ILLUM (8)

ILLUM (8)

FUEL GAGE (39-30)

OIL PRESS. WARN. (31-39)

L.H. SIGLAMP (14) .

ENG TEMP WARN. LP (35-39)

ILLUM (8)

HIGH BEAM LAMP

LIGHT

SW "

W/S WIPER

SW

BODY HARNESS

Fig.
123 - Instrument Panel and Cluster - Camaro

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES 15-7

6. The car begins to descend a hill--car speed in-

creases slightly and the regulator movements oc-

curing above occur again except in reverse. The

rubber drum is turned further against spring tension

and the air bleed orifices are uncovered more. This

bleeds more air to the Servo reducing the vacuum in

the unit. The diaphragm moves away from the

vacuum port, closes the throttle slightly, and with-

draws the tapered needle from the vacuum orifice.

With the orifice enlarged, the increased vacuum

counteracts the increased air bleed and the dia-

phragm finds a balance again at a reduced throttle

opening.

7.
Driver accelerates by pressing accelerator pedal-

car speed increases and the system responds by

moving the diaphragm to decrease throttle opening.

Since a bead chain is used, the chain merely relaxes

and has no effect on throttle operation. After the

driver releases pressure from the pedal, the throttle

will close until car speed decreases to the pre-set

speed. At that point the Regulator bleeds less air

to the Servo which opens the throttle enough to

maintain the pre-set speed. The system returns to a

stable condition.

8. Driver desires higher controlled speed, presses ac-

celerator until new speed is reached, and depresses

Engagement Switch fully and releases button--speed

sensing assembly tries to turn in a direction that

would decrease the throttle opening until the driver

fully depresses the Engagement Switch. Then the

current is cut off to the solenoid which retracts; the

solenoid nose expands the "U" clip releasing its

grip on the rubber drum. The drum and disk as-

sembly then rotates to a new position because of the

higher car speed. When the solenoid retracts, it also

shuts off vacuum to the Servo and opens the vacuum

port to atmospheric pressure within the Regulator

thereby bleeding down the Servo toward idle throttle

position. As the driver releases the Engagement

Switch, the contacts cause "pull in" and "hold in" of

the solenoid respectively. The system is engaged to
maintain the car speed at the time of Engagement

Switch release.

9. Driver desires lower cruising speed, presses En-

gagement Switch fully, waits until car speed de-

creases to desired speed then releases Switch--when

the Engagement switch is fully depressed the sole-

noid is de-energized causing the vacuum switch to

bleed down the Servo to idle throttle position and the

"U"
clip of the idle bleed valve is released from the

rubber drum. The drum and disk assembly is free

to rotate to a position which corresponds to vehicle

speed as the car slows. When the driver releases

the Engagement Switch, the unit "pulls in" and "holds

in" in the normal manner. The air bleed valve is

clutched to, the rubber drum at the car speed during

switch release. Vacuum is again applied to the

Servo and throttle control is assumed by the Regu-

lator to maintain the car speed at the time of switch

release.

10.
With system in operation, driver applies brakes--

simultaneously the Vacuum Release and Electric

Release Switches operate. The Vacuum Switch

bleeds air into the Servo through the air bleed line

coming from the Regulator. The vacuum is reduced

in the Servo and the throttle returns to idle position.

The Electric Release Switch cuts off power to the

entire system and the solenoid is de-energized. If

the driver removes his foot from the brake pedal the

Electric Switch again feeds voltage to the Engage-

ment Switch and the Vacuum Switch seals the air

bleed line. If the vehicle speed is above 20 mph

when this occurs, reduced voltage will flow to the

solenoid through the 40 ohm wire which will not be

sufficient to "pull in" the unit. If vehicle speed is

below 20 mph no current will flow since the tang

on the rubber drum has opened the low limit switch

points in the Regulator. In either case, after de-

pressing the brake pedal, the system will not con-

trol car speed until the driver operates the engage-

ment switch above 20 mph.

SERVICE OPERATIONS

The components of the Cruise Master system are de-

signed to be replaced should they become inoperative.

The Regulator is calibrated in such a manner during

manufacturing that overhaul operations are impractical.

However, one adjustment may be made to the Regulator to

correct speed drop or increase at the time of

engagement.

BRAKE RELEASE SWITCHES

ELECTRIC

Service — An inoperative switch must be replaced.

Switch replacement is identical to standard brake lamp

switch replacement.

Adjustment- The brake switch plunger must clear the

pedal arm when the arm is moved 1/4 inch measured at

the switch (Figure 7).

VACUUM

Service
—
An inoperative (sticking, plugged, or leaking)

switch must be replaced. Switch replacement is similar
to brake switch replacement. Be certain that the hose to

the switch is connected firmly and is not cracked or

deteriorated.

Adjustment- The brake switch plunger must clear the

pedal arm when the arm is moved 5/16 inch measured at

the switch (Figure 7).

ENGAGEMENT SWITCH

Service

replacement.
The engagement is serviced only by

Removal

1.
Pry the engagement button out of the turn signal knob

with a small thin bladed screwdriver (Figure 2).

2.
With a small hook or long nosed pliers, remove the

switch retaining ring.

3.
.Pull switch outward utilizing the slack in the wiring

harness.

4.
With a small soldering iron, unsolder the wires and

resolder them to the correct terminals of the re-

placement switch.

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES 15-9

Adjustment- Adjust the bead chain so that it is as tight

as possible without holding the throttle open when the

carburetor is set at its lowest idle throttle position.

When connecting the bead chain (engine stopped) manually

set the fast idle cam at its lowest step and connect the

chain so that it does not hold the idle screw off the cam.

If the chain needs to be cut, cut it three beads beyond the

bead which pulls the linkage.

REGULATOR

Service - A defective regulator, that is one which is not

simply out of adjustment, must be replaced. During re-

placement, check the hoses which connect to the regulator

and replace any which are cracked or deteriorated.

Air Filter

The air filter located in the solenoid cover should be

cleaned and re-oiled at engine oil change intervals.

1.
Snap the solenoid cover off.

2.
Remove the filter and wash it in kerosene or mineral

spirits. Squeeze it dry and wet with SAE 10 engine

oil.
Squeeze out excess oil and reinstall into the

cover.

3.
Attach the cover with neoprene seal to the solenoid

housing. Be certain that the cover fits tightly to the

housing.

One regulator adjustment is possible: Engagement-

Cruising Speed Zeroing (to remove any difference be-

tween engagement and cruising speed).

NOTE:
No regulator adjustment should be

made, however, until the following items have

been checked or serviced:

1.
Bead chain properly adjusted.

2.
All hoses in good condition, properly attached, not

leaking, not pinched or kinked.

3.
Regulator air filter clean and properly oiled.

4.
Electric and vacuum release switches properly

adjusted.

Engagement—Cruising Speed Zeroing

If the cruising speed is lower than the engagement

speed, loosen the orifice tube locknut and turn the tube

outward; if higher, turn the tube inward. Each 1/8 turn

will alter the engagement-cruising speed difference one

mph. Tighten the locknut after adjustment and check the

system operation at 50 mph.

ELECTRICAL SYSTEM CHECK OUT

1.
Check fuse and connector.

2.
Check electric brake switch as follows: Unplug con-

nector at brake switch. Connect ohmmeter at points

A and B on brake switch. The ohmmeter must indi-

cate infinity when the brake pedal is depressed and

continuity when pedal is released. The cruise re-

lease brake switch (electric) is adjusted as is the

standard stop light brake switch. Replace electric

brake switch if needed.

3.
Check engagement switch and connecting wiring as
follows: Unplug push button control connector

(brown, blue, black) at electrical wiring harness con-

nector and perform the following tests. (See Fig-

ure 10)

Test #1
—
Connect ohmmeter between terminal #1 (brown

wire) and terminal #2 (blue wire). Continuity shall be

maintained until switch is depressed all the way in.

Test #2
—
Connect ohmmeter between terminal #1 (brown

wire) and terminal #3 (black). No continuity shall be

shown; however, when the button is depressed halfway,

continuity shall be indicated. When the button is pressed

all the way down, no continuity shall be shown.

Test #3 — Connect ohmmeter between terminal #2 (blue

wire) and terminal #3 (black). Button released, no con-

tinuity; however, when the button is depressed partially

and fully, continuity shall be shown.

4.
Check regulator solenoid coil, low-speed switch, and

wiring harness as follows:

a. Disconnect engagement switch wire harness con-

nector from the main wire harness connector

(brown, blue, and black wires). Connect ohm-

meter
'
between point C (blue wire in main wire

harness) and ground. (Make sure the regulator is

well grounded to chassis.) The ohmmeter should

read 45 ohms ± 2 ohms. If a resistance of

greater value is shown, then disconnect the con-

nector from the regulator and measure the re-

sistance of the blue wire from point C to D. It

should measure 40 ohms. Check the resistance

from point E (vertical bar of terminal forming T)

to ground. It should measure 5 ohms ± 1/4 ohm.

Replace either the wiring harness or solenoid as

needed if greater values are indicated. The black

harness wiring from point F to G should also be

checked for continuity.

ENGAGEMENT SWITCH TEST

BUTTON POSITION

Cruise (released)

Engage (partially depressed)

Trim (fully depressed)
TERMINALS

1 TO 2

closed

Closed

open
1 TO 3

open

closed

open
2 TO 3

open

closed

closed

SERVO AND VACUUM SYSTEM CHECK OUT

To determine the condition of the diaphragm, remove

hoses from power unit and apply 14 inches of vacuum to

either vacuum tube opening (seal the other opening) and

hold in for one minute. The vacuum shall not leak down

more than 5 inches of vacuum in one minute. If leakage

is detected, replace servo. To utilize engine as a vac-

uum source, proceed as follows:

1.
DISCONNECT SERVO $EAD CHAIN and hoses from

servo and connect engine vacuum directly to vacuum

servo fitting (fitting in middle of servo). Seal the

servo unit opening.

2.
Note position of servo diaphragm.

3.
Start engine - the diaphragm should pull in.

4.
Clamp off engine vacuum supply line and check for

leakage. '

The cruise release brake switch (vacuum) and connecting

hoses can likewise be checked using a vacuum pump.

CHEVROLET CHASSIS SERVICE MANUAL

SPECIFICATIONS 26

LAMP USAGE (Cont'd.)
CANDLE

POWER

1

6

4

2

3

2

2

3

2

3

15

15
BULB

NUMBER

1445

212

67

1893

1816

194

1895

1816

257

1816

1003

93
Seat Separator-Compartment Lamp . . . . .

-Courtesy Lamp •

License Plate Lamp . .

Radio Dial Lamp

Chevrolet, Chevelle, Chevy n & Camaro

Corvette

Brake Alarm Lamp

. Chevrolet & Camaro . . .... . .

Chevelle & Chevy n . . . . .'. ;v . . . .

Corvette . . . . . . . .

Headlamp Mqtor Warning Lamp (Flashing) .

Clock Lamp (Corvette) .''> ....

Luggage Compartment Lamp. . ... . . . •

Underhood

FUSES AND CIRCUIT BREAKER

A circuit breaker in the light control switch protects

the headlamp circuit, thus eliminating one fuse. A

separate circuit breaker protects the power window,

seat and top circuits. On Corvettes the headlamp motor
circuit is also protected by a separate circuit breaker.

Where current load is too heavy, the circuit breaker

rapidly opens and closes, protecting the circuit until

the cause is found and eliminated.

louses located in the Fuse Panel under the instrument panel are:

Wiper (Chevrolet, Chevelle, and "F" Car) 3AF/AGC 20 Amp.

Back-up Lamp and Gauges. . . 3AG/AGC 10 Amp.

Heater - Air Conditioning 3AG/AGC 25 Amp.

Radio 3AG/AGC 10 Amp.

Radio - Wiper (Chevy II and Corvette) 3AG/AGC 20 Amp.

Instrument Lamps 3AG/AGC . 4 Amp.

Stop and Tail Lamps ........ t 3AG/AGC 20 Amp.

Clock, Lighter, Courtesy Lamps, and Hazard Warning 3AG/AGC 20 Amp.

In-Line Fuses:

Air Conditioning High Blower Speed Fuse located in wire running

from horn relay to A/C Relay

Comforton and Four Season SAE 30 Amp.

Universal & All Weather (Chevy H) SAE 20 Amp.

Fusible Links: ,

Pigtail lead at battery positive cable (except Corvette) 14 gage brown wire

Molded splice at Solenoid "Bat" terminal (Corvette only) 14 gage brown wire

Molded Splice Located at the horn relay 16 gage black wire

Molded splice in Voltage Regulator #3 terminal wire 20 gage orange wire

Molded splice in Ammeter circuit (Both sides of meter) 20 gage orange wire

CHEVROLET CHASSIS SERVICE MANUAL