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 462 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ah. SLAVE START/EXTERNAL POWER

(2) EXTERNAL POWER RECEPTACLE FAILS TO

RECEPTACLE CIRCUIT (M1 09A4/M109A5) —

OPERATE — CONTINUED

CONTINUED

—

CONTINUED FROM STEP A

B

1. Remove external power source from

external power receptacle.

2. Reconnect leads 49B and GND to external

power receptacle.

3. Disconnect NATO slave start-to-external

power wiring harness from driver’s bulkhead.

4. Reapply external power source.

5. Place red lead of multimeter on pin B (lead

49A) and black lead to ground.

6. Turn MASTER switch to SLAVE and check

for voltage.

7. Turn MASTER switch OFF.

Is voltage present?

I

Repair or replace lead 49A/49B of

NATO slave start-to-external power

wiring harness (para 8-63).

E

1. Reconnect NATO slave start-to-external

power wiring harness to driver’s bulkhead.

2. Disconnect lead 49 from batteries.

3. Place red lead of multimeter on lead 49 and

black lead to ground.

4. Turn MASTER switch to SLAVE and

check for voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 49 of driver’s

bulkhead-to-batteries lead assembly

(para 8-86).

Troubleshoot battery circuit (para 3-3a).

END OF TASK

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