TM-9-2350-311-34-1
HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS: HOWITZER, MEDIUM, SELF-PROPELLED, 155MM
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
SEPTEMBER 1994
TM-9-2350-311-34-1 - Page 137 of 352
7-1
TM 9-2350-311-34-1
CHAPTER 7
ELECTRICAL SYSTEM
GENERAL
This chapter describes and illustrates procedures for removal and installation of hull wiring harnesses and disassembly,
inspection, repair, and assembly of the hull electrical components.
For maintenance and repair of the alternator, refer to TM 9-2920-225-34 or TM 9-2920-258-30&P. For maintenance and
repair of the battery, refer to TM 9-6140-200-14. For maintenance and repair of the starter, refer to TM 9-2920-242-35,
TM 9-2920-243-34, or TM 9-2920-248-35 as required. For repair of other engine electrical components, refer to TM 9-
2815-202-34.
CONTENTS
PAGE
Section I
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
Section II
7-15
7-16
POWERPLANT AND HULL WIRING HARNESSES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..7-2
POWERPLANT AND HULL WIRING HARNESS LISTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..7-2
CIRCUIT IDENTIFICATION AND ILLUSTRATION OF ELECTRICAL WIRING HARNESSES
(M109A2/M109A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..7-4
CIRCUIT IDENTIFICATION AND ILLUSTRATION OF ELECTRICAL WIRING HARNESSES
(M109A4/M109A5) . . .
. . . . . . . . . . . . . . . . . . .
. . . . .
. . . . . . . . . . . . . . . . . . . . . 7-6
ENGINE DISCONNECT BRACKET-TO-BULKHEAD WIRING HARNESS (M109A2/M109A3)
(ENGINE MODEL 7083-7396) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8
ENGINE DISCONNECT BRACKET-TO-BULKHEAD WIRING HARNESS (M109A2/M109A3)
(ENGINE MODEL 7083-7391 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
DRIVER’S BULKHEAD-TO-MASTER RELAY WIRING HARNESS (M109A4/M109A5)
(ENGINE MODEL 7083-7396) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
DRIVER’S BULKHEAD-TO-MASTER RELAY WIRING HARNESS (M109A4/M109A5)
(ENGINE MODEL 7083-7391 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 7-20
BULKHEAD-TO-HEADLIGHTS/BILGE PUMP WIRING HARNESS. . . . . . . . . . . . . . . . . . . . . . . 7-24
BULKHEAD-TO-PORTABLE INSTRUMENT PANEL WIRING HARNESS
(ENGINE MODEL 7083-7396) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28
BULKHEAD-TO-PORTABLE INSTRUMENT PANEL WIRING HARNESS
(ENGINE MODEL 7083-7391 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-38
BULKHEAD-TO-DRIVER’S INSTRUMENT PANEL WIRING HARNESS. . . . . . . . . . . . . . . . . . . . .7-48
POWER LEAD WIRING HARNESS (M109A2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-60
POWER LEAD (M109A2/M109A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-67
POWER LEAD (M109A4/M109A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-72
HULL ELECTRICAL COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-78
RECTIFIER (M109A2/M109A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-78
RECTIFIER (M109A4/M109A5) . .
. .
... . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . 7-89
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