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 323 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP D

E

1.

2.

3.

4.

5.

Reconnect portable instrument panel

wiring harness to portable instrument

panel disconnect.

Disconnect lead 27 of bulkhead-to-portable

instrument panel harness from circuit

breaker output.

Place red lead of multimeters in circuit

breaker output and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

I

Is voltage present?

Repair or replace lead 27 from

bulkhead-to-portable instrument

panel wiring harness (para 849).

F

3.

4.

5.

Reconnect lead 27 to circuit breaker output.

Disconnect lead 10 from circuit breaker”

input.

Place red lead of multimeters in lead 10

and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

Replace circuit breaker (para 8-33,

M109A2/M109A3; para 8-34,

M109A4/M109A5).

Troubleshoot master relay circuit

(para 3-3b).

3-223