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 288 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 B

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1.

2.

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Reconnect lead 33A to ENGINE WATER

3.

4.

5.

TEMP gage.

Disconnect lead 27 from ENGINE WATER

TEMP gage.

Place red lead of multimeter in lead 27

and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

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2.

3.

4.

5.

Reconnect lead 27 to ENGINE WATER

TEMP gage.

Disconnect lead 27 from circuit breaker

output.

Place red lead of multimeter in circuit

breaker and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

Go to step 1.

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CONTINUED ON NEXT PAGE

TEMP gage (para 8-17).

1.

3-188