118—ELECTRICAL SYSTEM
CHRYSLER SERVICE MANUAL
LIGHTING SYSTEM
48.
HEADLIGHT AIMING AND ADJUSTMENT
a. Headlight Aiming
Place
car on
level surface with screen
25
feet
ahead
of
headlight lenses. The screen
(or
wall)
should
be
painted
a
light color.
The
horizontal
line
on
screen should
be
2
inches below center
line
of
headlights (Fig. 27). The center vertical
line should
be
equi-distant from two outer lines
which represent vertical center
of
headlights.
b.
Headlight Adjustment
The Sealed-Beam
is
adjusted vertically
by ad-
justing screw
at
top, and
horizontally
by
ad-
justing screw
at
side
of
headlight
(Fig. 28).
Adjust light beams
by
following pattern shown
in Figure 29. Adjustment should
be
made with
high beam turned
on.
49.
TESTING VOLTAGE
AT
HEADLIGHTS
One
of
the
factors affecting lighting efficiency
is loss
of
voltage
to
light bulbs
due
to
high
resistance
in
circuit. Headlight voltage must
be
measured with lights burning
and
battery
in
fully-charged condition.
Remove headlight rim and, with Sealed-Beam
unit partially removed from
its
mounting seat,
attach leads
of
reliable voltmeter
to
prongs
of
Sealed-Beam unit while
it is
still inserted
in
connector socket. With Sealed-Beam unit
in
its
correct position, top prong supplies current
for
GROUND
VERTICAL
ADJUSTING
SCREW
HORIZONTAL
ADJUSTING
SCREW
56x44
Fig.
28-Headlight Adjusting
34x179
Fig.
29—Pattern of Properly Aimed Headlight
1-Upper beam
of
right headlight
2-Upper beam
of
both headlights
3-Horizontal line
2
inches below headlight centers
4-Vertical line,
in
line with center
of
left headlight
5-Vertical line,
in
line with windsheld center strip
and radiator ornament
6-Vertical line,
in
line with center
of
right headlight
7-Floor level
low (traffic) beam. One
of
the side prongs sup-
plies current
for
high beam
and the
other
is
ground connection.
After engine
has
been stopped
and
lights
have burned
for
five minutes, voltage
at
head-
lights,
with high filament burning, should
not
be less than
11.25
volts. With lights burning,
engine warmed up and running at speed equiva-
lent
to car
speed
of
about
20
m.p.h., voltage
at
headlights should
be
not
less than
12.3
volts,
or more than 13.5 volts (with battery and gen-
erator
at
room temperature, approximately
70
degrees
F.).
If
voltage
is
low
at
either head-
light socket (with only standard equipment
in
the circuit), proceed
as
follows:
Test voltage output
of
battery which should
be
12
to
12.5
volts. Clean
and
tighten battery
terminals
and
ground cable. Check wires
and
connections
to all
lights,
and
check main head-
light switch
and
dimmer switch
for
high
re-
sistance. When voltmeter
is
placed between
ground
and
input side
of
switch
and
then
be-
tween ground
and
output side
of
switch (with
lights burning), difference
in
readings will
represent the voltage drop
in
switch. The same
method
may be
used
in
checking voltage drop
in wires
by
taking reading
at
each end
of
wire.
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