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 134 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 H

3.

4.

5.

Reconnect connector to starter switch relay.

Disconnect lead 14 from output side of

neutral safety switch.

Place red lead of multimeter in lead 14 and

black lead to ground.

Turn MASTER switch ON, push STARTER

switch, and check for voltage.

Turn MASTER switch OFF.

Is voltage present?

2.

3.

4.

5.

6.

Reconnect lead 14 to output side of neutral

safety switch.

Disconnect engine disconnect-to-bulkhead

harness from driver’s bulkhead.

Place a jumper wire from pin B to socket

B (lead 4596).

Place red lead of multimeter on pin T (lead

14) and black lead to ground.

Turn MASTER switch ON, push STARTER

switch and check for voltage.

Turn MASTER switch OFF.

I

Is voltage present?

Repair or replace lead 14 of engine

disconnect bracket-to-bulkhead

Repair or replace lead 14 of

bulkhead-to-portable instrument

panel wiring harness (para 8-49).

3-34