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 747 of 1275
8-42 CIRCUIT ID AND ILLUSTRATION OF WIRING HARNESSES (M109A4UM109A5)
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
2
3
4
5
6
7
8
9
10
11
15
Wiring harness 12268308— Alternator to
rectifier
Wire 82— From master relay to wire 82/49
Wire 27B — From wiring harness 12268418 —
Engine instrumentation bulkhead connector to
powerplant connector bracket
Wire 2 — From voltage regulator to wire 81
Lead 12268304 — From bulkhead connector to
slave start receptacle (wire 49) and to circuit
breaker panel (wire 10)
Wiring harness 12268308 — From bulkhead
connector to engine instrumentation
Wiring harness 10925829 — From accessory
control box to heater fuel pump and personnel
heater
Lead 12268419 — Bulkhead to override switch
lead
Wiring harness 12353400 — NATO slave start-
to-extemal power receptacle wiring harness
Wiring harness 12352794 — Ventilated
facepiece system wiring harness
Lead 12268304 — From circuit breaker to:
12 Slip ring segment board (47)
13 Telephone terminal (21 and 22)
14 Accessory control box (37 and 38)
Wiring harness 12260298 — From driver’s
compartment/connector to portable instrument
panel
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Wire 7 — Battery to ground
Wiring harness 12260287— Bulkhead
connector to driver’s compartment connector
bracket
Wiring harness 11594268 — bulkhead connector
to driver's instrument panel
Wire 68— Battery positive-to-negative connectors
Wiring harness 12353402 — Driver's bulkhead-to-
batteries wiring harness
Wire 81 — From batteries to master relay
Wiring harness 12268303 — Rectifier-to-voltage
regulator
Wiring harness 12353401 — Engine disconnect _
bracket-to-batteries lead assembly
Wiring harness 12268418 — Engine
instrumentation bulkhead connector-to-powerplant
connector bracket
Wire 82— From bulkhead connector to engine
starter
Wiring harness 10921380 — To headlight
assemblies
Wire 452 — Bilge pump relay to bilge pump
Wire 29-31 — To fuel level transmitters
Wires 76 — To fuel tank fuel pumps
Starter to engine electrical disconnect — Wiring
harness 12353072
8-102
TM 9-2350-311-20-1
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