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 209 of 828
TM 9–2350–311–20–2
3–97
h.
CAB LIGHTING SYSTEM
— CONTINUED
(5)
ALL CAB LIGHTS ARE OUT.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
Equipment Condition
Vehicle MASTER switch to OFF (TM 9–2350–311–10)
CAB POWER switch to OFF (TM 9–2350–311–10)
Repair or replace wire
138/147 (para 8–7).
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Disconnect harness from J2 connector at
gunner’s selector switch box assembly.
3.
Place one multimeter lead in quick-disconnect of
wire 138/147 socket and other lead to socket F
of J2 connector harness.
4.
Check for continuity.
Is continuity present?
Repair wire 138/147 from
quick-disconnect to dome
light assemblies (para
8–2).
1.
Disconnect wire 138/147 from quick-disconnect
at gunner’s selector switch box assembly.
2.
Turn MASTER and CAB POWER switches to
ON.
3.
Place red multimeter lead in wire 138/147
quick-disconnect leading to gunner’s selector
switch box assembly and black lead to ground.
4.
Check for voltage.
Is battery voltage present?
yes
no
A
yes
no
CONTINUED ON NEXT PAGE
B
GUNNER’S
SELECTOR
SWITCH BOX
J2 CONNECTOR
HARNESS SOCKET F
WIRE
138/147
–
+
–
+
WIRE
138/147
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