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 422 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ad. PARKING BRAKE WARNING LIGHT CIRCUIT —

PARKING BRAKE WARNING LIGHT FAILS TO OPERATE

CONTINUED

— CONTINUED

CONTINUED FROM STEP C

1. Reconnect lead 509E to PARKING BRAKE

warning light.

2. Disconnect lead 10 from circuit breaker input.

3. Place red lead of multimeter in lead 10 and

black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

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Is voltage present?

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I

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Troubleshoot master relay circuit

(para 3-3b).

1. Reconnect lead 10 from circuit breaker input.

2. Disconnect lead 450 from circuit breaker

output.

3. Place red lead of multimeter in circuit breaker

output and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

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Replace circuit breaker (para 8-33,

,

CONTINUED ON NEXT PAGE

3-322

E

M109A2/M109A3;8-34, M109A4

M109A5).