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 298 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING

CHART — CONTINUED

o. ENGINE WATER TEMP INDICATOR CIRCUIT —

(3) ENGINE LOW LEVEL COOLANT LIGHT FAILS TO

CONTINUED

LIGHT WHEN ENGINE COOLANT LEVEL IS LOW;

OPERATES WHEN PRESSED-TO-TEST —

CONTINUED

CONTINUED FROM STEP C

1. Reconnect bulkhead-to-portable instrument

panel wiring harness to driver’s bulkhead.

2. Disconnect bulkhead-to-engine bracket

wiring harness from engine disconnect

bracket.

3. Place a jumper wire from socket N (lead

3526) to ground.

4. Turn MASTER switch ON and press

COOLANT indicator light.

5. Turn MASTER switch OFF.

Does COOLANT indicator light operate?

I

Repair or replace lead 352B of engine

disconnect-to-bulkhead wiring harness

(para 8-45, M109A2/M109A4; 8-46,

M109A4/M10A5).

CONTINUED ON NEXT PAGE

3-198