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 342 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

t.

DOME LIGHT CIRCUIT — CONTINUED

DOME LIGHT FAILS TO OPERATE; ALL OTHER LIGHTS

OPERATE — CONTINUED

CONTINUED FROM STEP A

D

1. Reconnect lead 38 to dome light.

2. Disconnect lead 37-38 from circuit breaker

output.

3. Place red lead of multimeters in circuit

breaker output and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 37-38 of

bulkhead-to-driver’s instrument panel

wiring harness (para 8-50).

1. Reconnect lead 37-38 from circuit breaker

output.

2. Disconnect lead 10 from circuit breaker input.

3. Place red lead of multimeters 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 8-33,

M109A2/M109A3; 8-34, M109A4/

M109A5).

Repair or replace lead 10 of power lead

wiring harness (para 8-55, M109A2/

M109A3; 8-56, M109A4/M109A5).

3-242

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