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 INSTRUMENT PANEL AND/OR TRANS CONTROLLER ILLUMINATION LIGHTS MALFUNCTION—Continued 0038 00 BY 1. Remove malfunctioning bulb(s) from instrument panel illumination light(s) and/or TRANS CONTROLLER indicator. 2. Check continuity between bulb center contact and bulb base. 3. Does multimeter read less than infinity? YES NO BYN 1. Replace light bulb(s), as required (WP 0388 00). 2. Verify no faults found. B2Y 1. Does either instrument panel illumination light malfunction? YES NO B2YN 1. Replace harness 12349813 (WP 0374 00). 2. Verify no faults found. B3Y 1. Remove instrument panel for access (WP 0295 00). 2. Remove harness 12349881 plug (1) from LIGHTING CONTROL switch jack (2). 3. Remove harness 12349881 circuit 40 plug (3) or (4) from failing instrument panel light (5) or (6). 4. Measure resistance between harness 12349881 LIGHTING CONTROL switch plug (1), pin B (7), and failing circuit 40 light plug (3) or (4). 5. Does multimeter read 0 ohms? YES NO B3YN 1. Install bulbs. 2. Faulty harness 12349881, circuit 40. Beyond unit maintenance repair. 3. Notify supervisor. 0038 00-3