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ELECTRICAL SYSTEMS
LIGHTING SYSTEM
10-79
AIM UPPER BEAM OF LEFT HEADLAMP
Figure 10-1 01-Headlamp Aiming Chart
HEAD LAMP CENTER LEVEL
CENTER LINE AHEAD
OF RIGHT HAND LAMP
\
I,
A
~AIM
RIGHT HAND LAMP
SAME AS LEFT, EXCEPT
CENTER HOT SPOT
SIDEWAYS ON LINE
c-c
C
B
C
reAR AXIS
HOT SPOT SHOULD
BE CENT
ERED
SIDEWAYS
ON
LI
NE B-B
HOT SPOT Of HEADLAMP
UPPER BEAM
NO FURTHER ADJJSTMENT IS
NEEDED FOR LOWIER BEAM
B
CENTER LINE AHEAD
OF LEFT HAND LAMP
c.
Use of Headlamp Aiming Chart
If
a headlamp aiming machine is not avail-
able a chart may be prepared as shown in
figure 10-101.
It
is desirable to make the chart
on a large panel of plywood or other suitable
material, painted flat white, so that it can be
shifted into proper alignment with car, as ex-
plained later. Note that the chart consists of
two horizontal and three vertical lines. The
upper horizontal line is located at the same dis-
tance from floor as the center of headlamps
and the lower horizontal line
(A-A)
is 3"below
the headlamp center line. Where State laws re-
quire a loading allowance be governed by these
requirements for the lower line. Vertical lines
B-B and
C-C
are located at the center of head-
on car when headlamps are checked. Some
states have special requirements for headlamp
aiming adjustment and these requirements
should be known and observed.
Horizontal and vertical aiming of the head-
lamp beam is provided by the two beam adjust-
ing screws which move the mounting ring in
the body against the tension of the coil spring.
There is no adjustment for focus since the
sealed beam unit is set for proper focus during
.man uf' a ct ur ing assembly.
If
headlamps require
adjustment for proper aim, proceed as follows:
1.
Remove screw at bottom of headlamp
door, swing door outward at bottom and lift
up to remove.
2.
Adjust\
light beam up or down as re-
quired by turning the top beam adjusting
screw. See figure 10-100.
3. Adjust light beam to right or left as re-
quired by turning the side beam adjusting
screw.
4. Check final setting of headlamps after
installing headlamp doors.
Figure 10-1 OO-H
eadlamp
Aiming
Adjustments
Figure 10-99-lnstallation of Headlamp Sealed Beam Unit
certain that it is in proper codition, and care-
fully follow the instructions of the manufac-
turer. Headlamp aiming charts are also avail-
able and will give good results if used properly;
see subparagraph c below.
Regardless of method used for checking
head lamp aim, car must be at curb weight, that
is, with gas, oil, water, and spare tire, but no
passengers. Tires must be uniformly inflated
to specified pressure (par. 6-8).
If
car will
regularly carry an unusual load in rear com-
partment, or a trailer, these loads should be
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