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 200 of 828

TM 9–2350–311–20–2
3–88
3–3
TROUBLESHOOTING
— CONTINUED
h.
CAB LIGHTING SYSTEM
The cab lighting system consists of three dome light assemblies and internal lighting for the M15 elevation quadrant,
M117/M117A2 panoramic telescope, and M118A2/M118A3 elbow telescope.
Power for these lighting components is routed from the contact arm assemblies through the gunner’s selector switch box
assembly.
LEGEND:
1. Electrical contact arm assemblies
2. Gunner’s selector switch box assembly
3. M117/M117A2 panoramic telescope
4. M118A2/M118A3 elbow telescope
5. M15 elevation quadrant
6. Dome light assemblies
147A
147B
147C
147
M118A2/M118A3
ELBOW TELESCOPE
M117/M117A2
PANORAMIC TELESCOPE
M15 ELEVATION
QUADRANT
GUNNER’S
SELECTOR
SWITCH BOX
100
100
100
DOME LIGHT (3)
138
PICTORIAL VIEW
ELECTRICAL DIAGRAM
2
1
3
1
6
1
4
6
1
5
6
CIRCUIT
BREAKER
100


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