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
3-188


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