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 CIRCUIT — CONTINUED (1) FRONT B.O. MARKER LIGHTS FAIL TO OPERATE; ALL OTHER LIGHTS OPERATE Tools General mechanic’s tool kit (item 64, Appx H) Driver’s instrument panel released (para 8-17) Multimeters (item 36, Appx H) TA-1 Probe kit (item 43, Appx H) A 1. Disconnect bulkhead-to-driver’s instrument 2. 3. 4. panel wiring harness from main light switch. Place a jumper wire from socket F (lead 15) to socket E (lead 20/24). Turn MASTER switch ON, place main light switch to B.O. MARKER position, and check front B.O. marker lights for operation. Turn MASTER and main light switches OFF. Do front B.O. marker lights operate? Replace light switch (para 8-17). B 1. Reconnect bulkhead-to-drive's instrument panel wiring harness to light switch. 2. Remove inoperative B.O. marker assembly (para 8-22). 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 light switches OFF. Is voltage present? Replace B.O. marker assembly (para 8-22). CONTINUED ON NEXT PAGE 3-258