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 178 of 828

TM 9–2350–311–20–2
3–67
Go to step M.
1.
Turn MASTER switch to OFF.
2.
Reconnect wire 100 to power relay box assembly.
3.
Disconnect wire 104 at power relay box
assembly.
4.
Turn MASTER and CAB POWER switches to ON.
5.
Ensure that hydraulic pressure in power pack
main accumulator assembly is below 925 psi
(6378 kPa).
6.
Place red multimeter lead in power relay box
assembly connector for wire 104 and black lead
to ground.
7.
Check for voltage.
Is battery voltage present?
I
CONTINUED ON NEXT PAGE
POWER
RELAY BOX
ASSEMBLY
WIRE 104
CONTINUED FROM STEP H
yes
no
+–
yes
no
Repair or replace wire 100
(para 8–4). If malfunction
persists, clean contact
board segments and con-
tact arm assemblies (Chap-
ter 9).


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