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 753 of 1275

8-44 POWERPLANT WIRING HARNESS (M109A4/M109A5)

This task covers:

a. Removal

b. Disassembly/Repair

c. Assembly

d. Installation

Lockwashers (4) (item 89, Appx G)

M109A4/M109A5

Lockwashers (4) (item 94, Appx G)

T

OO

I

S

General mechanic’s tool kit (item 64, Appx H)

Air intake grille opened (para 11-8)

Batteries disconnected (para 8-28)

Engine compartment access cover removed (para 11-5)

Electrical tape — black (item 62, Appx D)

Transmission access doors opened (11-7)

NOTE

On vehicles with engine model 7083-7396, connector 14 is used for the flame heater

system. On vehicles with engine model 7083-7391, connector 14 is used for the glow

plug controller system.

Connector

Wire

Connector

wire

No.

Electrical Lead To:

No.

No.

Electrical Lead To:

No.

1

2

3

4

5

6

7

8

9

Engine disconnect bracket

Low level coolant indicator

Low level coolant indicator

Transmission oil temperature transmitter

Transmission oil temperature switch

Transmission oil pressure switch

Engine coolant temperature switch

Transmission oil pressure transmitter

Engine coolant temperature transmitter

352B

352A

324

5090

509C

509A

321

33A

10

11

12

13

14

15

16

17

18

Starter solenoid coil

14B

Engine oil pressure switch

509B

In-tank fuel pump and generator system

relay switch

76B

Engine oil pressure transmitter

36

Flame heater system connector (engine

model 7083-7396) or glow plug controller

connector (engine model 7083-7391 )

Not used

Alternator

Starter protection relay

To rectifier

588

503

8-108

TM 9-2350-311-20-1