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 346 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

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u. SERVICE HEADLIGHTS, TAILLIGHT, AND STOP (1) HEADLIGHTS FAIL TO OPERATE; ALL OTHER

LIGHT CIRCUIT — CONTINUED

LIGHTS OPERATE — CONTINUED

CONTINUED FROM STEP A

B

1.

Place a jumper wire from socket F (lead 15)

to socket M (lead 16).

2. Turn MASTER switch ON and check

headlights for operation.

3. Turn MASTER switch OFF.

Do headlights operate?

Replace main light switch (para 8-17).

c

1. Leave jumper wire from socket F (lead 15) to

socket M (lead 16).

2. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from dimmer switch.

3. Place red lead of muitimeter in socket G (lead

16) 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 16 of

bulkhead-to-driver’s instrument panel

wiring harness (para 8-50).

CONTINUED ON NEXT PAGE

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