Chevrolet 70 1969 Series, Shop Manual

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CHASSIS ELECTRICAL A N D INSTRUMENTS 12-11
Installation (Fig. 13)
1. Push wiring connector plug over blade-type
terminals on back of sealed-beam unit.
2. Position sealed-beam unit in mounting ring
with molded lugs on back of sealed-beam unit en­
gaged in locating holes in mounting ring.
3. Hook slot in retaining ring over retaining
clip near top of mounting ring and position retaining
ring over sealed-beam unit.
4. Using a hooked tool, pull out on retaining
spring and engage in slot near bottom of retaining
ring (Inset, fig. 13).
5. Adjust headlight beam as previously rec­
ommended under "Headlight Beam Adjustment.”
6. Position headlamp bezel over mounting ring
and attach with screws.
PARKING LIGHTS
Parking lights used on conventional cab and
tilt cab models are illuminated with main light
switch pulled out to first detent position. On
aluminum tilt cab models, lights are illuminated
by a toggle switch on the instrument panel.
On conventional cab and tilt cab models, the
parking light circuit is protected by a circuit
breaker built into the main light switch.
B U L B R E P L A C E M E N T
Removal
On conventional cab models, raise hood and
pull socket and bulb assembly from lamp assembly
mounted in grille panel. Press inward on bulb anc’
turn counterclockwise to remove from socket.
On tilt cab models, remove two screws which
attach parking lamp lens to light assembly and
remove lens. Press bulb inward and turn counter­
clockwise to remove from socket.
Installation
N O T E : Refer to "Light Bulb Data” at end of
this section for bulb size and type.
On conventional cab models, install new bulb
in socket and insert socket and bulb assembly in
lamp assembly. On tilt cab models, install new
bulb in socket, then attach lens and gasket to lamp
assembly with two screws.
L A M P A S S E M B L Y R E P L A C E M E N T
To remove parking lamp assembly on conven­
tional cab models, remove bulb and socket assem­
bly, then remove two screws attaching lamp as­
sembly to front grille panel. Pull lamp assembly
from opening in grille panel.
On tilt cab models, remove two nuts which
attach lamp assembly to front end sheet metal.
Pull lamp assembly from opening and disconnect
harness at junction.
To install a new lamp assembly, position the
assembly in opening and install two attaching nuts.
Insert bulb and socket in lamp assembly or con­
nect harness at junction.
STOP A N D TAILLIGHT
The stop and taillight is a combination-type
lamp, having a double-filament bulb. The taillight
filament is of 4 candlepower, and the stop light
filament is of 32 candlepower. On some vehicles,
an outlook lens is used in bottom of the light as­
sembly to provide illumination for the license plate.
B U L B R E P L A C E M E N T
Removal
Remove lens retaining screws, then remove
lens and gasket from housing. Press bulb inward
and turn counterclockwise to remove.
Installation
Refer to "Specifications” for bulb size and
type. Note that J-slots in bulb sockets are of dif­
ferent depths and lugs on bulb base are located at
different distances from end of base. Lugs and
slots must be matched to permit installation of
bulb. Insert bulb in socket, press inward and turn
clockwise to lock in place. Position lens and gasket
on body and attach with screws.
BACK-UP LIGHTS
The back-up light circuit is fed from the igni­
tion switch control circuit. The back-up lamp
switch, mounted on the transmission, is activated
by the reverse shift rail when the ignition or con­
trol switch is placed in the " O N " position and trans­
mission shift lever is in reverse.
B U L B R E P L A C E M E N T
Removal
Remove screws from lens to lamp assembly
and remove lens. Press bulb inward and turn coun­
terclockwise to remove from socket.
Installation
N O T E : Refer to "Light Bulb Data" at end of
this section for bulb size and type.
Press new bulb into socket and turn clockwise
to lock in place. Position lens and gasket on body
and attach with screws.
CHEVROLET SERIES 70 80 HEAVY DUTY TRUCK S h O ? M ANUAL