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 150 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

d. STARTER MOTOR CIRCUIT (M109A4/M109A5) —

(1) ENGINE DOES NOT CRANK; ALL ELECTRICAL

CONTINUED

ACCESSORIES OPERATE — CONTINUED

CONTINUED FROM STEP Q

1.

2.

3.

4.

5.

Reconnect lead 10 to output side of

circuit breaker.

Disconnect lead 10 from input side of

circuit breaker.

Place red lead of multimeter in lead 10

and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

Replace circuit breaker (para

8-34).

1. Reconnect lead 10 to input side of

circuit breaker.

2. Disconnect master relay-to-driver’s bulkhead

lead assembly from driver’s bulkhead.

3. Place red lead of multimeter in lead 82

and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 10 of power

lead wiring harness (para 8-56).

3-50

Repair or replace lead 82 of master

relay-to-driver's bulkhead lead

assembly (para 8-82).