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 378 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

x.

INSTRUMENT PANEL/PORTABLE INSTRUMENT

(2) ALL INSTRUMENT PANEL LIGHTS FAIL TO

PANEL LIGHT CIRCUIT — CONTINUED

OPERATE

.

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

Portable instrument panel cover removed (para 8-17)

Multimeters (item 36, Appx H)

Driver’s instrument panel released (para 8-17)

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

A

1. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from light switch.

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

to socket B (lead 40).

4. Turn MASTER and instrument panel light

switches ON and check all instrument panel

lights for operation.

5. Turn MASTER and instrument panel light

switches OFF.

Do all panel lights operate?

I

Replace light switch (para 8-1 7).

I

CONTINUED ON NEXT PAGE

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