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 410 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ab. BILGE PUMP CIRCUIT — CONTINUED

BILGE PUMP FAILS TO OPERATE — CONTINUED

CONTINUED FROM STEP H

2.

3.

4.

5.

Reconnect lead 450 to BILGE PUMP switch

input.

Disconnect lead 450 from circuit breaker

output.

Place red lead of multimeter in circuit breaker

output and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 450 of driver’s

instrument panel wiring harness (para

1. Reconnect lead 450 to circuit breaker output.

2. Disconnect lead 10 from circuit breaker

input.

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 circuit breaker (para 8-33,

M109A2/M109A3; 8-34, M109A4/

M109A5).

Troubleshoot master relay circuit (para

3-3b).

3-310