TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download
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TM 9-2350-277-20-1 SERVICE HEADLIGHTS DON’T WORK—Continued 0031 00 AY 1. Remove circuit 17 (high beam) plug (1) or circuit 18 (low beam) plug (2) from failing service headlight jack (3). 2. Measure voltage between harness 12349881 circuit 17 plug (1) or circuit 18 plug (2) and ground. 3. Does multimeter read less than 17 volts? YES NO AYN 1. Replace service headlight bulb (WP 0303 00). 2. Verify no faults found. A2Y 1. Is failing headlight located on right side of carrier? YES NO A2YN 1. Repair circuit 514 or 515 between left IR headlight and dimmer switch (WP 0382 00). 2. Verify no faults found. A3Y 1. Remove harness 8763491 plug (1) from harness 12349881 jack (2) at carrier bulkhead. 2. Measure voltage between harness 12349881 jack (2) pin C (low beam) (3) or pin B (high beam) (4) and ground. 3. Does multimeter read less than 17 volts? YES NO A3YN 1. Replace faulty harness 8763491 (WP 0373 00). 2. Verify no faults found. 0031 00-3