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 349 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP A

I

B

1. Install inoperative headlight assembly (para

8-21).

2. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from dimmer switch.

3. If low beam is inoperative, place red lead of

multimeters on pin E (lead 18) and black lead

on pin G (lead 16).

4. Place dimmer switch in low beam position

and check for continuity.

5. If high beam is inoperative, place red lead of

multimeters on pin F (lead 17) and black lead

on pin H (lead 16).

6. Place dimmer switch in high beam position

and check for continuity.

Is continuity present?

I

Replace dimmer switch (para

8-17).

Wiring Harness (para 8-47).

Repair or replace lead 17 and/or 18 of

bulkhead-to-headlights/bilge pump

END OF TASK

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