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

  TM-9-2350-311-20-1 - Page 749 of 1275

TM 9-2350-311 -20-1
8-43 POWERPLANT WIRING HARNESS (M109A2/M109A3)
This task covers:
a. Removal
b. Disassembly/Repair
c. Assembly
d. Installation
Applicable Configurations
M109A2/M109A3
Tools
General mechanic’s tool kit (item 64, Appx H)
Materials
/Part s
Electrical tape — black (item 62, Appx D)
Equipment
Conditions
Air intake grille opened (para 11-8)
Batteries disconnected (para 8-28)
Engine compartment access cover removed (para 11-5)
Transmission access doors opened (para 11-7)
NOTE
On vehicles with engine model 7083-7396, connectors 14, 15, and 16 are part of
connector 22 and are used for the flame heater system. On vehicles with engine
model 7083-7391, connectors 14, 15, and 16, are part of connector 22 and are used
for the glow plug controller system.
Connector
Wire
No.
Electrical Lead To:
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Low level coolant indicator
Low level coolant indicator
Transmission oil temperature transmitter
Transmission oil high temperature switch
Transmission oil low pressure switch
Transmission oil pressure transmitter
Engine coolant high temperature switch
Engine coolant temperature transmitter
Starter motor solenoid from starter relay
Engine oil low pressure switch
In-tank fuel pump and generator
system relay switch
Engine oil pressure transmitter
Starter motor solenoid from master relay
352B
352A
324
509D
509C
321
509A
33A
14B
509B
76B
36
82
Connector
Wire
No.
Electrical Lead To:
No.
14
15
16
17
18
19
20
21
22
Flame heater ignition coil (engine model
7083-7396) or glow plug controller
(engine model 7083-7391)
Flame heater air pump (engine model
7083-7396) or glow plug controller
(engine model 7083-7391 )
Flame heater solenoid (engine model
7083-7396) or glow plug controller
(engine model 7083-7391)
Not
used
Master circuit wiring harness
Starter cable connector
486
486
486A
588
1226810
82
Rectifier connector
500, 501, 502, 1, and 3
Alternator connector
500, 501, 502, 1, and 3
Flame heater connector (engine model
7083-7396) or glow plug controller
(engine model 7083-7391 )
486,486, and 486A
8-104


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