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TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download

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TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED v. B.O. MARKERS AND B.O. DRIVE LIGHTS (3) B.O. DRIVE LIGHT FAILS TO OPERATE; ALL CIRCUIT — CONTINUED OTHER LIGHTS OPERATE — CONTINUED CONTINUED FROM STEP A 1. Reconnect bulkhead-to-driver’s instrument panel wiring harness to main light switch. 2. Remove reflector and B.O. drive light bulb (para 8-22). 3. Place red lead of multimeters in center contact and black lead to ground. 4. Turn MASTER switch ON, place main light switch to B.O. DRIVE position, and check for voltage. 5. Turn MASTER and main light switches OFF. Is voltage present? C 1. Install reflector and B.O. drive light bulb (para 8-22). 2. Remove headlight assembly (para 8-23). 3. Place red lead of multimeters in socket G (lead 19) and black lead to ground. 4. Turn MASTER switch ON, place main light switch to B.O. DRIVE position, and check for voltage. 5. Turn MASTER and main light switches OFF. I Is voltage present? CONTINUED ON NEXT PAGE 3-264 Replace B.O. drive light bulb (para 8-22). Replace lead 19 of headlight wiring harness (para 8-48).