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 294 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

o. ENGINE WATER TEMP INDICATOR CIRCUIT —

(2) ENGINE LOW LEVEL COOLANT LIGHT FAILS TO

CONTINUED

LIGHT WHEN PRESSED-TO-TEST; ALL OTHER

LIGHTS OPERATE

CONTINUED FROM STEP F

1.

2.

3.

4.

5.

Reconnect lead 27 to COOLANT indicator

light.

Disconnect lead 27 from circuit breaker

output.

Place red lead of multimeter in circuit

breaker output and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

I

1. Reconnect lead 27 to circuit breaker output.

2. Disconnect portable instrument panel wiring

harness from portable instrument panel

bracket.

3. Place a jumper wire from socket P (lead

4596) to socket C (lead 459).

4. Place red lead of multimeter in socket A

(lead 27).

5. Turn MASTER switch ON and check for

voltage.

6. Turn MASTER switch OFF.

Is voltage present?

CONTINUED ON NEXT PAGE

3-194