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 351 of 1275

TM 9-2350-311-20-1

B

1. Reconnect bulkhead-to-driver's instrument

panel wiring harness to dimmer switch.

2. Remove inoperative headlight assembly

(para 8-21 ).

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

multimeters in socket A (lead 18) and black

lead to ground.

4. Turn MASTER switch ON, place dimmer

switch in the low beam position, and check for

voltage.

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

multimeters in socket B (lead 17) and black

lead to ground.

6. Turn MASTER switch ON, place dimmer

switch in the high beam position and check

for voltage.

7. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 17 and/or 18 of

headlight wiring harness (para 8-48).

Replace sealed beam units (para

END OF TASK

3-251

8-22).