TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download
Page 196 of 858
TM 9-2350-277-20-1 BLACKOUT DRIVE LIGHT DOESN’T WORK—Continued 0030 00 3Y 1. Install harness 12349881 plug on BO DRIVE light. 2. Remove instrument panel for access. See task: remove instrument panel mounts and ground lead (WP 0295 00). 3. Remove harness 12349881 circuit 19 (1) and 520 (2) from IR/BO selector jacks (3) and (4). 4. Measure resistance between IR/BO selector jack (3) and (4). 5. Does multimeter read 0 ohms? YES NO 3YN 1. Install harness 12349881 plug on BO DRIVE light. 2. Replace IR/BO selector switch (WP 0282 00). 3. Verify no faults found. 4Y 1. Remove harness 12349881 plug (1) from light control switch jack (2). 2. Turn switch to BO DRIVE. 3. Measure resistance between light control switch jack (2) pins D (3) and F (4). 4. Does multimeter read 0 ohms? YES NO 4YN 1. Install harness 12349881 plugs on IR/BO selector switch jacks. 2. Replace lighting control switch (WP 0282 00). 3. Verify no faults found. 0030 00-2