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 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

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