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 425 of 828
TM 9–2350–311–20–2
8–1
CHAPTER 8
CAB ELECTRICAL SYSTEM
GENERAL
This chapter describes unit level maintenance procedures for the cab electrical system. Step-by-step procedures are pro-
vided for maintaining electrical leads and harnesses, electrical components, and the intercommunications system.
CONTENTS
Page
Section I.
ELECTRICAL LEADS AND HARNESSES
8–1
WIRING HARNESS AND CABLE REPAIR
8–2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–2
GUNNER’S SELECTOR SWITCH BOX WIRING HARNESS
8–12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–3
PANORAMIC TELESCOPE TO DOME LIGHT LEAD ASSEMBLY
8–16
. . . . . . . . . . . . . . . . . . . . . . . . . . .
8–4
CAB POWER LEAD ASSEMBLY
8–24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–5
POWER RELAY BOX TO PUMP MOTOR LEAD ASSEMBLY
8–28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–6
POWER RELAY BOX TO PRESSURE SWITCH WIRING HARNESS
8–31
. . . . . . . . . . . . . . . . . . . . . . . .
8–7
CAB TRAVERSING MECHANISM HARNESS
8–34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–8
GUNNER’S ELEVATION CONTROL SWITCH LEAD ASSEMBLY
8–38
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–9
NBC POWER LEAD ASSEMBLY
8–42
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–10
NBC GROUND LEAD
8–46
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section II.
COMPONENT MAINTENANCE
8–11
DOME LIGHT ASSEMBLIES
8–47
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–12
GUNNER’S SELECTOR SWITCH BOX ASSEMBLY
8–52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–13
POWER RELAY BOX ASSEMBLY
8–60
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section III. INTERCOMMUNICATIONS SYSTEM
8–14
POWER RELAY BOX TO INTERCOM POWER SUPPLY LEAD ASSEMBLY
8–67
. . . . . . . . . . . . . . . . . .
8–15
POWER SYSTEM WIRING HARNESS (INTERCOM)
8–70
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–16
AMPLIFIER AND CONTROL BOX
8–77
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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