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 354 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

u. SERVICE HEADLIGHTS, TAILLIGHT, AND STOP

(5) STOP LIGHT FAILS TO OPERATE; ALL OTHER

LIGHT CIRCUIT — CONTINUED

LIGHTS OPERATE — CONTINUED

CONTINUED FROM STEP B

1.

Place a jumper wire from lead 75 to lead 75

at stop light switch.

2. Turn MASTER switch ON and check

stop light for operation.

3. Turn MASTER switch OFF.

Does stop light operate?

Replace stop light switch (para 8-37).

1. Reconnect both leads 75 to stop light switch

2. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from main light switch.

3. Place a jumper wire from socket F (lead 15)

to socket K (lead 75).

4. Place red lead of multimeters in socket A (lead

75) and black lead to ground.

5. Turn MASTER switch ON, press brake pedal,

and check for voltage.

6. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 75 of

I

bulkhead-to-driver’s instrument panel

wiring harness (para 8-50).

CONTINUED ON NEXT PAGE

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