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 383 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP A

1.

2.

3.

4.

5.

6.

7.

Install inoperative HI-BEAM indicator

light bulb (para 8-17).

Disconnect two leads 519 of bulkhead-to-

driver’s instrument panel wiring harness from

HI-BEAM indicator light.

Place red lead of multimeters in one lead 519

and black lead to ground.

Turn MASTER switch ON, main light switch

to SER. DRIVE, depress dimmer switch,

and check for voltage.

Place red lead of multimeters in other lead 519

and black lead to ground.

Turn MASTER switch ON, main light switch

to SER. DRIVE, depress dimmer switch,

and check for voltage.

Turn MASTER and main light switches OFF.

Is voltage present?

I

Replace HI-BEAM indicator light

assembly (para 8-17).

1

1. Reconnect two leads 519 of bulkhead-to-

2.

3.

4.

5.

6.

driver’s instrument panel wiring harness

leads to HI-BEAM indicator light.

Disconnect bulkhead-to-driver’s instrument

panel wiring harness from dimmer switch.

Place red lead of multimeters on pin C (lead

514/51 5) and black lead on pin D (lead 51 9).

Depress dimmer switch and check for

continuity.

Place red lead of multimeter on pin G (lead

16) and black lead on pin H (lead 519);

Depress dimmer switch and check for

I

continuity.

I

Is continuity present?

Repair or replace two leads 519 of

bulkhead-to-driver’s instrument panel

wiring harness (para 8-50).

Replace headlight dimmer switch (para 8-37).

END OF TASK

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