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ELECTRICAL SYSTEMS
RETAINER
R
I
N G ~
SPRING
,'e..-
SCREW
GASKET
SEALED
BE
AM
UNIT
,
:8.
tWIRING
LIGHTING SYSTEM
10-77
SCREWS
CONNECTO R
Figure 10-94-Headlamp Disassembled
of body and connects to a terminal block on the
radiator mounting strap. The mounting ring,
which supports the sealed beam unit, forms a
ball and socket joint with the body, to which it
is attached by one coil spring and two beam
adjusting screws. The sealed beam unit is at-
tached to the wiring connector and is held in
the mounting ring by the retaining ring which
is attached to mounting ring by three screws.
The headlamp door surrounds the retaining
ring and is attached to the body by a lug at the
top and one screw at bottom of door. A rubber
gasket, held in the door by W-shaped retaining
springs, forms a seal between door and re-
tainer ring. See figure 10-94.
\~CAT1N G
LUG
\"M' " "
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Figure 10-95-Headlamp Sealed Beam Unit
b. Sealed Beam Unit and Headlight Beams
The sealed beam unit consists of a lens, re-
flector, terminal plug, and two lamp filaments
assembled into one securely sealed unit. See
figure 10-95. The lamp filaments are located
with respect to the reflector so that two sep-
arate and distinct headlight beams may be ob-
tained, depending upon which filament is
burning.
When the lower lamp filament is burning,
an upper or straight forward light beam is ob-
tained. The upper beam is designed to illumi-
nate the road evenly, and is for use on the
high-
way when no
other
vehicles are approaching.
See figure 10-96.
Figure 10-96-Light Distribution with Upper Headlight Beam
When the
upper
lamp filament is burning, a
low
er
or
depressed
light
beam
is
obtained.
The
lower beam is
designed
so 't hat it
does
not
throw a dazzling light into the
eyes
of an ap-
proaching
driver.
At
t
he same
time, the
dis-
tribution of light is such that the right sid
e
of
road is illuminated as far ah
ead
as is practica-
ble without causing
glare
on curves.
See
fig-
ure 10-97. The lower
beam
is intended for use
in traffic and on the highway when me
eting
other vehicles.
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