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ELECTRICAL SYSTEMS
LIGHTING SYSTEM
10-83
*
55 BULB
BULB SOCKET
-
KNOB SLEEVE
GROUND STRAP
CONTACT SLEEVE
/
RA
DIO GRILLE
r
KNOB
.
·
~
77 ~
.
.
_
-=-Q
WIRE
TERMINAL}
CONTACT BALL
BODY
PULL OUT KNOB
TO REMOVE BULB
MOUNTI NG
NUT
Figure 10-1 OS-Rear License Lamp-194S Series 50-70
On 1948
models,
the instrument panel lights
are controlled by the lighting switch and a
separate instrument panel light switch mounted
on the radio speaker grille. These lights can-
not be turned on except when the lighting
switch is in either the "Parking" or "Driving"
position. The instrument panel light switch is
a "push-pull" type having four positions as
follows:
Off
Knob pushed all the way in
Bright
Knob pulled out one notch
Medium
Knob pulled out two notches
Dim
Knob pulled to last notch
A fuse located on the 1948 model instrument
panel light switch protects the switch, instru-
ment and clock light circuits. The fuse can be
replaced without removing the switch. The up-
per terminal on switch is the hot or liv
e
ter-
minal. The lower terminal feeds the instrument
and clock lights.
The 1948 model instrument panel light
switch can be removed from the radio grille by
removing the knob and the mounting nut.
Loosen set screw on underneath side of knob,
using' a
%2"
Allen wrench, then pull knob out.
Us
e
Wrench J 1589 to remove switch mounting
nut, then remove switch and disconnect wires.
b. Map Light Switch Assembly
A map and front
compartment
light switch
assembly is mounted on the radio speaker
grille in 1948
models,
and in the lower right
side of the instrument cluster in 1949 Series
50-70. The switch makes contact to turn on the
light when the "MAP LIGHT" knob is pulled
out. The map light circuit is protected by the
thermo circuit breaker on the lighting
switch.
Figure 10-1 09-Map Light Switch-194S Model
The switch knob may be removed for re-
placement of lamp bulb by firmly pulling it far-
ther out from the "light on" position. When
the knob is installed, align the key on knob
with the slot in knob sleeve. The 194
8
model
switch assembly is attached by a special nut
which may be removed with Wrench J 1588,
after removal of switch knob. See figure 10-
109. The 1949 S
eries
50-70 switch
assembly
is
attached by two screws which may be removed
after removal of knob.
c. Instrument Panel Compartment Light
The instrument panel compartment (glove
box) is lighted by a 2 CP lamp bulb mounted in
a light switch attached to top edge of the com-
partment. The spring-loaded switch makes con-
tact when the compartment door is opened. As
the door is closed it depresses the switch but-
ton to break contact and turn the light off.
This circuit is protected by the thermo circuit
breaker on the lighting switch.
d. Dome Lamp and Switches
The dome lamp is controlled by a switch on
the center body pillar or over rear quarter win-
dow on left
side.
On all cars except 1948 Series
50-70
sedans,
which have courtesy lamps, the
dome light is also controlled by spring-loaded
jamb switches on both front and the right rear
door hinge pillars. The jamb switch automati-
cally turns dome light on when door is opened.
On 1948
models,
the dome lamp in closed
bodies contains one 6 CP double contact lamp
bulb; in convertible coupes one 2 CP single
contact bulb is
used.
On Series 40, the dome
lamp wiring is protected by the
thermo
circuit
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