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 152 of 1275

3-3 TROUBLESHOOTING CHART —

CONTINUED

d. STARTER MOTOR CIRCUIT (M109A4/M109A5)—

(2) COMBAT OVERRIDE SWITCH WILL NOT

CONTINUED

OVERRIDE

INITIAL SETU P

Applicable Configurations

Personnel

Required

M109A4/M109A5

Two

T

OO

I

S

Equipment Conditions

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

Transmission left access door open (TM 9-2350-311-10)

Multimeter (item 36, Appx H)

Battery access doors open (TM 9-2350-311-10)

TA-1 probe kit (item 43, Appx H)

Portable instrument panel cover removed (para 8-17)

(Long test leads may be needed for some tests;

16 AWG wire may be used as an extension.)

A

1. With MASTER switch ON and fuel shutoff

handle pulled out, crank starter until it

automatically shuts off.

2. Disconnect leads 14C and GND from

combat override switch.

3. Place a jumper wire from lead 14C to lead

GND wire.

4. Turn MASTER switch ON and push

STARTER switch.

5. Turn MASTER switch OFF.

Does engine crank?

Replace combat override switch

(para 8-40).

CONTINUED ON NEXT PAGE

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TM9-2350-311-20-1