TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 745 of 1275
TM 9-2350-311 -20-1
SECTION Ill. POWERPLANT AND HULL WIRING HARNESSES
This section provides instructions for removal and installation of powerplant and hull wiring harnesses. Instructions for
test, disassembly, and assembly of individual wiring harnesses are in Chapters 2 and 3.
8-41 CIRCUIT ID AND ILLUSTRATION OF WIRING HARNESSES (M109A2M109A3)
NOTE
• Each electrical cable is marked with a wire-numbered metal tag attached to the
junction of the terminal of the cable. All electrical circuits shown in schematics and
wiring diagrams are identified by wire numbers listed in each area.
• See task sheets in this section, Appendix 1, and specific troubleshooting pages for
detailed routing of wiring harnesses. See paragraph 2-13 for electrical repair kit
data.
LEGEND
1 Wiring harness 12268102— Alternator-to-
rectifier
2 Wire 82— From master relay to wire 82/49
3 Wire 27B — From wiring harness 12268100 to
voltage regulator
4 Wire 2 — From voltage regulator to wire 81
5 Lead 11593784 or 12260266 — From bulkhead
connector to slave start receptacle (wire 49) and
to circuit breaker panel (wire 10)
6 Wiring harness 10925829— From accessory
control box to air cleaner blower assembly
7 Wiring harness 10925829— From accessory
control box to heater fuel pump and personnel
heater
8 Lead 11593784 or 12260266 — From circuit
breaker to:
9 Slip ring segment board (47)
10 Telephone terminal (21 and 22)
11 Accessory control box (37 and 38)
12 Wiring harness 12260298— From driver’s
compartment/connector to portable instrument
panel
13 Wire 7— Battery to ground
14 Wiring harness 12260287— Bulkhead
connector to driver's compartment connector
bracket
15 Wiring harness 11594268— Bulkhead
connector to driver's instrument panel
16 Wire 68— Battery positive-to-negative connectors
17 Wire 81 — From batteries to master relay
18 Wiring harness 11593806— Rectifier-to-voltage
regulator
19 Wire 82/49— Engine starter from lower
powerplant connector bracket to bulkhead
connector
20 Wiring harness 12268100— Engine
instrumentation bulkhead connector-to-powerplant
connector bracket
21 Ground wire — Powerplant to hull
22 Wiring harness 12268102— From bulkhead
connector to engine instrumentation
23 Wire 82— From bulkhead connector to engine
starter
24 Wiring harness 10921380— To headlight
assemblies
25 Wire 452— Bilge pump relay to bilge pump
26 Wire 29-31 — To fuel level transmitters
Wires 76 — To fuel tank fuel pumps
27 Wire 352A and 352B — From wiring harness
12268102 to aeration detector
8-100
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