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 201 of 828

TM 9–2350–311–20–2
Change 2
3–89
h.
CAB LIGHTING SYSTEM
— CONTINUED
(1)
ONE OR MORE DOME LIGHTS ARE OUT,
BUT SIGHTING EQUIPMENT LIGHTS OPER-
ATE.
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 ON (TM 9–2350–311–10)
Dome light assembly switch to position A
(TM 9–2350–311–10)
Repair or replace wire 138
from connector to failed
dome light assembly (para
8–3).
yes
no
A
yes
no
Move dome light assembly switch to positions
B and C.
Does only one light come on?
Go to step C.
B
WIRE 138
DOME LIGHT
ASSEMBLY
+–
1.
Turn MASTER switch to OFF.
2.
Disconnect wire 138 at failed dome light
assembly.
3.
Turn MASTER switch to ON.
4.
Place red multimeter lead in wire 138 and black
lead to ground.
5.
Check for voltage.
Is battery voltage present?
CONTINUED ON NEXT PAGE


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