THERMAL OVERLOAD RELAY
lights provide sufficient illumination to enable units in
a convoy to keep in line while progressing at slow
OFF
speeds. Two blackout headlights, two blackout
taillights, and a blackout stoplight are provided for this
illumination. All other lights in the vehicle are off when
the blackout lights are on. Blackout driving and rear
PARK
marker lights are illustrated in figure 6-96.
ASf06097
HEAD
Figure 6-97.--Main light switch.
SWITCHES
Taillights and Stoplights
In most vehicle installations, the lighting circuits
are arranged so that the headlights, parking lights,
Taillights and stoplights are ordinarily combined,
taillights, and instrument lights are controlled by one
with two light bulbs contained in a single housing with
switch (main light switch). The switch is a push-pull
a red lens. A larger light bulb (about 15 candlepower) is
type or a push-pull with a rotary contact. The rotary
used for the stoplight; a smaller light bulb (about 3
contact is a rheostat used to control the intensity of the
candlepower) is used for the taillight. Taillights and
instrument lights. It is actuated by rotating the switch
stoplights are sometimes enclosed in a single light bulb
knob. These switches have three positions--OFF,
that has a double filament. Taillights are on whenever
PARK LIGHTS, and HEADLIGHTS. The light switch
the light switch is in any of the ON positions.
is located on the instrument/control panel within easy
reach of the operator (fig. 6-97). Most types of current
Backup Lights
support equipment used aboard ship and on flight lines
use a single toggle switch to operate lights.
When a backup light is used, it is mounted so as to
Vehicles provided with blackout lights have a
direct light to the rear of the vehicle. It is arranged and
special blackout light switch, which incorporates the
wired so that a switch turns it on when the gearshift
service lights and blackout lights in one unit. This
lever is put into reverse position.
switch is shown in figure 6-98, with its connections to
the various units in the lighting system. The plunger
Blackout Lights
knob has three positions--OFF, BLACKOUT
LIGHTS, and SERVICE LIGHTS. In its second or
Blackout lights are used to enable a vehicle to move
middle position, the switch turns the blackout lights on
at night without being observed from the air. These
BLACKOUT
SERVICE
HEAD LAMP
BLACKOUT
LIGHT SWITCH POSITIONS
OFF
SAFETY LOCK BUTTON
BLACKOUT STOP LAMP
BLACKOUT TAIL LAMP
TRAILER CONNECTION
INSTRUMENT
LIGHT
SWITCH
GROUND
SERVICE
STOP LIGHT
HEAD
SWITCH
LAMPS
TAIL
STOP
DIMMER
LAMP
LAMP
SWITCH
BRAKE
THERMAL
CIRCUIT
BREAKER
BLACKOUT TAIL LAMP
SERVICE STOP LAMP
SERVICE TAIL LAMP
INSTRUMENT LAMPS
BLACKOUT
HEAD LAMP
BATTERY
ASf06098
Figure 6-98.--Blackout light switch and connection.
6-77
