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 148 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 N

1. Reconnect lead 14 to output side of

STARTER switch.

2. Disconnect lead 14 at connector between

STARTER switch and neutral safety switch.

3. Place red lead of multimeter on lead 14 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?

Repair or replace lead 14 of

bulkhead-to-portable instrument

panel wiring harness (para 8-49).

Repair or replace lead 14 of diode

wiring harness (para 8-61).

3-48