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 119 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP B

1. Reconnect lead 81 to master relay.

2. Disconnect lead 82 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?

Replace master relay (para 8-29).

D

1.

.

2.

3.

4.

5.

Reconnect lead 82 to master relay.

Disconnect engine bracket-to-drivets

bulkhead lead assembly (lead 82, M109A4/

M109A5; lead 49, M109A2/M109A3) from

driver’s bulkhead.

Place red lead of multimeter on pin of lead

82 (lead 49, M109A2/M109A3) and black

lead to ground.

Turn MASTER switch ON, and check for

voltage.

Turn MASTER switch OFF.

Is voltage present?

Repair or replace engine bracket-to-drivets

bulkhead lead assembly (para 8-81, M109A2/

M109A3; para 8-82, M109A4/M109A5).

Repair or replace power lead wiring harness (para

8-54, M109A2; para 8-55, M109A2/M109A3; para

8-56, M109A4/M109A5).

3-19