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 198 of 828
TM 9–2350–311–20–2
3–86
3–3
TROUBLESHOOTING — CONTINUED
g.
CAB POWER SYSTEM — CONTINUED
(2)
CAB ELECTRICAL COMPONENTS OPERATE
NORMALLY, BUT CAB POWER INDICATOR
LIGHT DOES NOT ILLUMINATE.
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)
CAB POWER switch to ON (TM 9–2350–311–10)
Replace CAB POWER in-
dicator light (para 8–12).
yes
no
1.
Turn MASTER and CAB POWER switches to OFF.
2.
Open gunner’s selector switch box assembly.
3.
Turn CAB POWER and MASTER switches to
ON.
4.
Place red multimeter lead on terminal 2 of CAB
POWER indicator light and black lead to ground.
5.
Check for voltage.
Is battery voltage present?
Replace indicator lamp
(para 8–12). If malfunction
persists, go to step C.
Push “press to test” CAB POWER indicator light.
Does indicator light illuminate?
A
yes
no
B
CONTINUED ON NEXT PAGE
CAB
POWER
INDICATOR
LIGHT
–
+
TERMINAL
CAB POWER
INDICATOR LIGHT
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