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 193 of 828
TM 9–2350–311–20–2
Change 2
3–81
g.
CAB POWER SYSTEM — CONTINUED
(1)
ALL CAB ELECTRICAL COMPONENTS FAIL
TO OPERATE.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
References
TM 9–2350–311–20–1
Equipment Condition
Vehicle MASTER switch to ON (TM 9–2350–311–10)
CAB POWER switch to OFF (TM 9–2350–311–10)
1.
Place red multimeter lead to screw (use either of
two screws) on bottom of contact arm assembly
and black lead to ground.
2.
Check for voltage.
Is battery voltage present?
1.
Place red multimeter lead to wire 47 terminal at
the segment board and black lead to ground.
2.
Check for voltage.
Is battery voltage present?
Go to step E.
yes
no
Troubleshoot hull
electrical system
(TM 9–2350–311–20–1).
A
yes
no
B
CONTINUED ON NEXT PAGE
NOTE
Steps B through D must be repeated for each contact
arm assembly in contact with segment.
CONTACT ARM
ASSEMBLY
WIRE 47
+–
–+
CONTACT ARM
ASSEMBLY
Back to Top
