TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 140 of 828
TM 9–2350–311–20–2
3–31
NOTE
The following illustrates: terminal locations on lamps and switches, semiconductor, and circuit
breakers; connector receptacles; and general electrical layout of gunner’s selector switch box as-
sembly. Refer to these diagrams to locate multimeter probes when performing troubleshooting
steps.
TO COLLIMATOR
GUNNER’S SELECTOR SWITCH BOX
ASSEMBLY WIRING DIAGRAM
VIEWED WITH BOX COVER OPEN
CONNECTOR
CAB POWER
SWITCH
TRAVERSE
CONTROL
SWITCH
ELEVATION
CONTROL
SWITCH
CONNECTOR
RECEPTACLE IDENTIFICATION
INDICATOR LAMP 1
CAB POWER
SWITCH
ANODE
CATHODE
CIRCUIT
BREAKER
ELEVATION CONTROL
SWITCH
INDICATOR LAMP 2
TRAVERSE
CONTROL
SWITCH
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