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 132 of 1275

TM 9-2350-311

20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

C. STARTER MOTOR CIRCUIT (M109A2/M109A3) —

ENGINE DOES NOT CRANK; ALL ELECTRICAL

CONTINUED

ACCESSORIES OPERATE — CONTINUED

CONTINUED FROM STEP C

E

1. Reconnect lead 82 to engine disconnect

bracket.

2. Disconnect engine disconnect bracket-to-

driver’s bulkhead wiring harness from

engine disconnect bracket.

3. Place red lead of multimeter in socket P

(lead 14B) and black lead to ground.

4. Turn MASTER switch ON, push STARTER

switch and check for voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Go to step Q.

F

1. Reconnect connector to engine disconnect

bracket.

2. Disconnect engine disconnect bracket-to-

driver’s bulkhead wiring harness from

starter switch relay.

3. Place a jumper wire from socket C to socket

B (lead 14B).

4. Turn MASTER switch ON and push

STARTER switch.

5. Turn MASTER switch OFF.

Does engine crank?

CONTINUED ON NEXT PAGE

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