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 203 of 828
TM 9–2350–311–20–2
Change 2
3–91
h.
CAB LIGHTING SYSTEM
— CONTINUED
(2)
M118A2/M118A3 ELBOW TELESCOPE LIGHT
IS OUT, BUT ALL OTHER LIGHTS OPERATE.
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)
1.
Check ground lead for good connection.
2.
Place red multimeter lead in one socket and black
lead in ground socket of wire 147A.
3.
Check for voltage.
Is battery voltage present?
Repair ground lead (para
8–3).
1.
Disconnect wire 147A at M146 mount.
2.
Turn MASTER switch to ON.
3.
Place red multimeter lead in each socket of wire
147A and black lead to ground.
4.
Check for voltage.
Is battery voltage present at one socket only?
yes
no
A
yes
no
B
Replace wire 147A (para
8–3).
CONTINUED ON NEXT PAGE
WIRE 147A
WIRE 147A
+
–
+
–
M146
MOUNT
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