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 148 of 828
TM 9–2350–311–20–2
3–39
1.
Reconnect wire 819B at electric clutch housing
(M109A2/M109A3 howitzers) or clutch valve
(M109A4/M109A5 howitzers).
2.
Open gunner’s selector switch box assembly.
3.
Place one multimeter lead at TRAVERSE
CONTROL switch output terminal 6 and other
lead to pin G of J2 connector.
4.
Check for continuity.
Is continuity present?
1.
Reconnect harness at J2 connector of gunner’s
selector switch box assembly.
2.
Turn MASTER and CAB POWER switches to ON.
3.
Place red multimeter lead at TRAVERSE
CONTROL switch input terminal 5 and black lead
to ground.
4.
Check for voltage.
Is battery voltage present?
C
yes
no
D
CONTINUED FROM STEP B
OUTPUT TERMINAL
+
–
+
TRAVERSE
CONTROL
SWITCH
GUNNER’S
SELECTOR
SWITCH BOX
ASSEMBLY
J2 CONNECTOR PIN G
CONTINUED ON NEXT PAGE
INPUT TERMINAL
GUNNER’S
SELECTOR
SWITCH
BOX ASSEMBLY
CAB POWER
SWITCH
TRAVERSE
CONTROL
SWITCH
Replace wire from TRAV-
ERSE CONTROL switch to
pin G of J2 connector (para
8–12).
–
+
Replace wire from TRAV-
ERSE CONTROL switch to
ELEVATION CONTROL
switch (para 8–12).
Replace TRAVERSE CON-
TROL switch (para 8–12).
yes
no
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