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 258 of 1275

TM

9-2350-311-20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

m. ALTERNATOR CIRCUIT (M109A2/M109A3) —

ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE

CONTINUED

INDICATION: NOT CHARGING, UNSTEADY OR

INACCURATE

READING — CONTINUED

CONTINUED FROM STEP C

1.

Reconnect lead 27 to circuit breaker output.

2. Disconnect battery ground leads.

3. Disconnect portable instrument panel wiring

harness from portable instrument panel

disconnect.

4. Place a jumper wire from socket C (lead 459)

to socket P (lead 459B).

5. Place red lead of multimeters in socket A

(lead 27) and black lead to ground.

6. Reconnect battery ground leads.

7. Turn MASTER switch ON and check for

voltage.

8. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 27 of driver’s

bulkhead-to-portable instrument panel

wiring harness (para 8-49).

Repair or replace lead 40A of portable

instrument panel wiring harness (para

8-57).

3-158