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10-76
LIGHTING SYSTEM
ELECTRICAL SYSTEMS
(352)
the other terminals while observing any change
in the brilliance of lights affected.
With switch in "Parking" position (first notch
out) connect jumper wire between
No.1
and
No. 2 terminals and note change in parking
lights.
Bridge between
No.1
and
No.3
termi-
nals and note change in taillights. With switch
in "Driving" position (last notch out) bridge
between No.1 and No.4 terminals and note
change in headlights.
If
no change in brilliance of lights is noted
the switch contacts are satisfactory and the
cause is in the wiring circuit connections
or.
lamp bulb. If switch is faulty it must be re-
placed since internal repairs cannot 'be
made.
RADIO SPEAKER GRILLE
NON-DETACHABLE THERMO
CIRCUIT BREAKER
Figure 10-92-1948 Model Lighting Switch Removal
'
d. Replacement of Lighting Switch
1.
Disconnect ground cable from battery
and disconnect wires from lighting switch.
2. On 1948 model switch, remove switch
knob by loos.ening set screw on underneath side
of knob, using
%2"
Allen wrench. See figure
10-92.
2a. On 1949 Series 50-70, pull switch knob
out to last notch, then depress the spring-
load
'ed
latch button on switch while pulling the
knob and rod assembly out of switch. See fig-
ure 10-93.
3. On 1948 model switch, remove mounting
nut using Wrench J 1589, then remove switch
from grille. Remove control rod by depressing
the retaining spring.
3a. On 1949 Series 50-70, remove mount-
ing nut and anti-rattle spring, using Wrench
J 1589 or a wide blade screwdriver, then re-
move switch from panel.
4. When installing lighting switch, connect
wires according to color codes as shown on
chassis wiring circuit diagrams in Section
10-J.
When connecting battery ground cable use care
to properly wind the clock (par. 10-21,
d).
e. Test of Thermo Circuit Breaker
To test the thermo circuit breaker, remove
lighting switch from instrument panel to avoid
Figure 10-93-1949 Ser
ies
50-70 Lighting Switch
possible damage to ad
jacent instruments.
Since the current required to open the cir-
cuit breaker contacts depends somewhat on
outside
temperature,
the circuit breaker should
be tested at normal temperature (70° to 80° F.)
.
1.
Connect an ammeter and a
carbon-pile
rheostat in series with the No. 1 terminal of
lighting switch and positive terminal of a 6-
volt battery, and set rheostat to provide maxi-
mum resistance. Rheostat must have capacity
for 42 amperes and be adjustable down to .14
ohms.
2. Connect the protected (not numbered)
terminal of lighting switch to negative post of
battery.
3. Adjust rheostat to give 42
amperes.
The
circuit breaker should start vibrating in three
minutes or less.
4. Adjust rheostat to give 30 amperes on
ammeter. The circuit breaker should remain
closed indefinitely at 30 amperes.
5. If circuit breaker does not operate as
specified the lighting switch assembly should
be replaced. The circuit breaker is not adjust-
able and no attempt should be made to alter the
calibration by bending' the bi-metal blade. The
contact points must not be filed or sanded.
10.54 HEADLIGHTS AND CONTROLS
a. Headlamp Assembly
The headlamp assembly on each front fender
consists of a body, wiring, connector, mounting
ring, sealed beam unit, retainer ring, door, and
gasket. See figure 10-94.
The headlamp body is attached to the fender
with a gasket between body and fender to pro-
vide a water-tight seal. The wiring to which
the connector is attached extends through rear
-,
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