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 406 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 A

I

B

1

“

Reconnect lead 452 to bilge pump.

2. Disconnect engine disconnect bracket-to-

bulkhead wiring harness from bilge pump

relay.

3. Place red lead of multimeter in socket C

(lead 452B) and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

I

Is voltage present?

I

I

Go to step E

C

1. Place a jumper wire from socket C (lead

452B) to socket B (lead 452).

2. Turn MASTER and BILGE PUMP switches

ON and check bilge pump for operation.

3. Turn MASTER and BILGE PUMP switches

OFF.

Does bilge pump operate?

I

Repair or replace lead 452 of

bulkhead-to-headlights/bilge

pump wiring harness (para 8-47).

CONTINUED ON NEXT PAGE

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