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 A4Y 1. Turn MASTER SWITCH to OFF. 2. Install harness 8763491 circuit 17 (high beam) or 18 (low beam) on service headlight. 3. Faulty harness 12349881 circuit 17 or 18 between bulkhead and dimmer switch. Beyond unit maintenance repair. 4. Notify supervisor. BY 1. Measure resistance between dimmer switch jack (1) pins G (2) and E (3) and between pins G (2) and F (4). Use multimeter. Multimeter should read 0 ohms once and infinity once. 2. Click dimmer switch and check continuity between dimmer switch jack (1) pins G (2) and E (3) and between pins G (2) and F (4). Multimeter should read infinity once and 0 ohms once. 3. Is dimmer switch working properly? YES NO BYN 1. Replace headlight high beam selector switch (WP 0333 00). 2. Verify no faults found. B2Y 1. Faulty harness 12349881 circuit 18 (low beam) or circuit 17 (high beam). Beyond unit maintenance repair. 2. Notify supervisor. 0031 00-4