TM 9-2320-211-20
NOTE
b.
Radio Receptacle.
(1) R e m o v a l . Remove the four nuts, lock-
A circuit number tag is placed at both ends
washers, and bolts securing the radio receptacle to
of the cable.
the bracket. R e m o v e t h e r e c e p t a c l e f r o m t h e
b. Harness. When a group of cables go from one
general location to another, the cables are bound
b r a c k e t , and disconnect the two cables at the
connectors.
together to form a harness. Three main harnesses
(2) Installation. Connect the two receptacle
are used on these vehicles. One harness extends
from the generator regulator to the circuit breakers,
c a b l e s to the cables in the cab. Position the
receptacle on the bracket, and install four bolts,
ammeter, and batteries. Another harness extends
lockwashers, and nuts. Tighten the nuts.
from the light switch to the instrument cluster,
circuit breaker, a n d all lights. The remaining
c. Trailer Coupling Receptacle.
harness extends from the light switch to the trailer
(1) Removal.
Remove the four nuts, lock-
coupling receptacle.
washers, and bolts securing the trailer coupling
receptacle to the mounting. Disconnect the cables
2-141. Receptacles
at the connectors behind the receptacle. Push the
a. Slave Battery Receptacle.
receptacle to the rear, a n d remove it from the
(1) Removal.
Remove
the
four
screws
vehicle.
securing the slave battery receptacle (fig. 2-71) to
(2) Installation. Connect the cables at the
the right rear corner of cab. Pull the receptacle
connectors behind the trailer coupling receptacle.
away from the cab, and disconnect the two cables at
Position the receptacle on the mounting, and install
the connectors.
the four bolts, lockwashers, and nuts. Tighten the
(2) Installation. Connect the two receptacles
nuts.
cables to the two cables inside the cab. Position the
receptacle (fig. 2-71) on the side of the cab, and
install the four screws. Tighten the screws.
S e c t i o n XXlIl. INSTRUMENT CLUSTER, SWITCHES,
C I R C U I T BREAKERS, SENDING UNITS, HORN AND
D I R E C T I O N A L SIGNAL CONTROLS
2-142. G e n e r a l
unit and the low air pressure buzzer sending units
are connected into the air reservoir-to-air governor
a. Instrument Cluster. Instrument cluster
components (fig. 2-33) include the air pressure
line.
gage, ammeter, fuel gage, headlight high-beam
c. Switches and Circuit Breakers.
indicator light, oil pressure gage, panel lights,
NOTE
speedometer, tachometer, tachograph (M52A1 and
The key numbers noted in parentheses are
M52A2 models only), and the temperature gage.
for figure 2-161, unless otherwise in-
The speedometer, tachometer, and tachograph are
dicated.
mechanically operated units connected by flexible
(1) Manually operated switches (fig. 2-161).
s h a f t s to their respective sending units. T h e
These switches include the ignition (16), light (17),
tachograph takes the place of both the speedometer
electric brake lock (32), horn (21), dimmer (22),
and tachometer on some M52A1 and M52A2
warning light (26), and floodlight (35).
models. All other instrument cluster gages are
(2) Stoplight switch (fig. 2-188). T h i s a i r -
electrically operated.
operated switch (21) is connected into the com-
b. Sending Units. There are individual sending
pressed air system, and it is located just in front of
u n i t s for the air pressure gage, fuel gage, oil
the transfer case.
pressure
tachometer,
gage,
speedometer,
(3) Circuit breakers (fig. 2-44). T h e s e f o u r
tachograph, termperature gage, and low air pressure
automatic reset type circuit breakers protect the
warning buzzer. Both the air pressure gage sending
various electrical circuits.
