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 207 of 828
TM 9–2350–311–20–2
Change 2
3–95
h.
CAB LIGHTING SYSTEM
— CONTINUED
(4)
M15 ELEVATION QUADRANT 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.
Disconnect wire 147C at M15 quadrant.
2.
Turn MASTER switch to ON.
3.
Place red multimeter lead in each socket of wire
147C and black lead to ground.
4.
Check for voltage.
Is battery voltage present at one socket only?
1.
Check ground lead for good connection.
2.
Place red multimeter lead in one socket
connector and black lead in ground socket of
wire 147C.
3.
Check for voltage.
Is battery voltage present?
yes
no
A
yes
no
CONTINUED ON NEXT PAGE
B
Replace wire 147C (para
8–3).
Repair ground lead (para
8–3).
WIRE 147C
WIRE 147C
+–
M15
QUADRANT
+–
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