Exterior Lights - GMC 1975 Motorhome Operating Manual

HEADLIGHTS
Headlight Replacement
Headlight Replacement
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AG1:J5TMENT
removing plugs, clean plug wells thoroughly,
clean the threads and seats in the cylinder heads
to assure proper seating and heat transfer .
Make a headlight beam adjustment check a
regular part of your "Safety Maintenance" pro-
gram. Sealed-Beam units are No. 6014 which
are equipped with ground guide points for the
use of a mechanical aiming device. Your author-
ized dealer is best qualified to adjust your head-
lights .
Headlight Beam Adjustment
NOTE : Cutouts in headlight bezel permit ac-
cess to adjustment screws.
Headlights should be adjusted properly . The
top adjusting screw provides vertical adjustment
and the side adjusting screw provides horizontal
adjustment . Headlights should not have to be
adjusted after replacing Sealed-Beam unit, pro-
viding headlights were in proper adjustment
before replacement and adjusting screws were
not disturbed during replacement .
To replace a Sealed-Beam unit, remove bezel.
Then disengage the tension spring using a stiff
hooked tool . Rotate the Sealed-Beam assembly
slightly to disengage mounting ring slots from
groove of each adjusting screw, then pull for-
ward. Disconnect wiring at the base of unit and
separate the Sealed-Beam assembly by remov-
ing the two retaining screws . Install Sealed-
Beam unit in reverse order of removal .
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EXTERIOR LIGHTS
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Chassis Fuse Block
All exterior lights can be easily replaced by
removing lens, pushing bulb in slightly and turn-
ing counterclockwise, except side marker lights
which are simply pressed in. Then, with new
bulb, reverse procedure.
CHASSIS FUSES, FUSIBLE LINKS,
CIRCUIT BREAKERS
The wiring circuits in your vehicle are de-
signed to be protected from short circuits by a
combination of fuses, circuit breakers, and fusi-
ble thermal links in the wiring itself. This helps
to reduce the hazard of electrically-caused fires
in the vehicle.
The fuse and circuit breaker block is located
behind an access cover in the glove compart-
ment. All chassis circuits are protected by fuses
or circuit breakers located here except :
HEATER BLOWER-Which has a 30-amp
in-line fuse located behind the right access
door near the heater blower motor.
HEADLAMP CIRCUITS-Are protected by
a circuit breaker in the main light switch . An
electrical overload in the light circuit will
cause the lights to go on and off or in some
cases to remain off. If this condition develops,
have the wiring circuits checked immediately.