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 272 of 1275

TM 9-2350-311-20-1

3-3

TROUBLESHOOTING CHART — CONTINUED

n. ALTERNATOR CIRCUIT (M109A4/M109A5) —

ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE

CONTINUED

INDICATION: NOT CHARGING, UNSTEADY OR

INACCURATE READING — CONTINUED

1. Reconnect lead 27 to circuit breaker output.

E

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.

Is voltage present?

Replace circuit breaker (para

8-34).

F

1. Reconnect lead 10 to circuit breaker input.

2. Disconnect lead 82 of master relay-to-

driver’s bulkhead lead assembly from

master relay.

3. Place red lead of multimeter in master

relay and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

I

Troubleshoot master relay circuit

(para 3-3b).

CONTINUED ON NEXT PAGE

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