TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 286 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED o. ENGINE WATER TEMP INDICATOR CIRCUIT — (1) ENGINE WATER TEMP INDICATOR NEEDLE FAILS CONTINUED TO MOVE OR IS UNSTEADY; ALL OTHER GAGES OPERATE PROPERLY — CONTINUED CONTINUED FROM STEP C 1. Reconnect portable instrument panel wiring harness to portable instrument panel disconnect. 2. Disconnect battery ground leads. 3. Disconnect bulkhead-to-portable instrument panel wiring harness from driver’s bulkhead. 4. Place a jumper wire from pin B to socket B (lead 400-459B). 5. Reconnect battery ground leads. 6. Turn MASTER switch ON and check ENGINE WATER TEMP gage for reading. 7. If gage shows a minimum reading, place a jumper wire from pin E (lead 33A) to ground. 8. Check gage for reading. 9. Turn MASTER switch OFF. Does ENGINE WATER TEMP gage show minimum when not grounded, and maximum when grounded? I Repair or replace lead 33A of bulkhead- to-portable instrument panel wiring CONTINUED ON NEXT PAGE 3-188