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 361 of 1275

TM 9-2350-311-20-1

(2) REAR B.O. MARKER LIGHTS FAIL TO OPERATE;

ALL OTHER LIGHTS OPERATE

T

OO

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General mechanic’s tool kit (item 64, Appx H)

Driver’s instrument panel

Multimeters (item 36, Appx H)

TA-1 probe kit (item 43, Appx H)

released (para 8-1 7)

A

1. Disconnect bulkhead-to-driver's instrument

panel wiring harness from main light switch.

2. Place a jumper wire from socket F (lead

15) to socket E (lead 20/24).

3. Turn MASTER switch ON, apply brake pedal,

and check rear B.O. marker lights for

operation.

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4. Turn MASTER switch OFF.

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Do rear blackout marker lights operate?

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Replace light switch (para 8-17)

1.

Reconnect bulkhead-to-driver’s instrument

panel wiring harness to light switch.

2. Remove inoperative B.O. marker assembly

(para 8-25).

3. Place red lead of multimeters in center contact

of socket and black lead to ground.

4. Turn MASTER switch ON, place main light

switch to B.O. MARKER position, and check

for voltage.

5. Turn MASTER and main light switches OFF.

Is voltage present?

Replace B.O. marker assembly (para 8-22).

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