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 136 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 L

M

1. Reconnect lead 14 to output side of

STARTER switch.

2. Disconnect lead 10 from input side of

STARTER switch.

3. Place red lead of multimeter in lead 10

and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Replace STARTER switch

(para 8-17).

N

1. Reconnect lead 10 to input side of

STARTER switch.

2. Disconnect lead 10 of driver’s instrument

panel wiring harness from output side of

circuit breaker.

3. Place red lead of multimeter in output

side of circuit breaker and black lead to

ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

I

Is voltage present?

Repair or replace lead 10 of driver’s

instrument panel wiring harness

CONTINUED ON NEXT PAGE

3-36