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 360 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

v. B.O. MARKERS AND B.O. DRIVE LIGHTS

(1) FRONT B.O. MARKER LIGHTS FAIL TO

CIRCUIT — CONTINUED

OPERATE; ALL OTHER LIGHTS OPERATE —

CONTINUED

CONTINUED FROM STEP D

E

1. Reconnect lead 20 of bulkhead-to-headlights/

bilge pump wiring harness to headlight

resilient mount wiring harness.

2. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from driver’s bulkhead.

3. Place a jumper wire from pin H to socket H

(lead 459).

4. Place red lead of multimeters in socket E (lead

20) and black lead to ground.

5. Turn MASTER switch ON, place main light

switch to B.O. MARKER position, and check

for voltage.

6. Turn MASTER and main light switches OFF.

Is voltage present?

bulkhead to headlights/bilge pump

Repair or replace lead 20/24 of

bulkhead-to-driver’s instrument panel

END OF TASK

3-260

wiring harness (para 8-47).

wiring harness (parra 8-50).