TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 SERVICE AND/OR BLACKOUT STOPLIGHTS MALFUNCTION—Continued 0038 00 3Y 1. Turn MASTER SWITCH OFF. 2. Remove main harness circuit 75A plug (1) from stoplight switch jack (2). 3. Remove main harness circuit 75B plug (3) from stoplight switch jack (4). 4. Measure resistance between switch jacks (2) and (4) with switch depressed and with switch released. 5. Does multimeter read infinity with switch depressed and 0 ohms with switch released? YES NO 3YN 1. Replace stoplight switch (WP 0274 00). 2. Verify no faults found. 4Y 1. Install main harness circuit leads 75A and 75B on stoplight switch. 2. Partially remove instrument panel (WP 0256 00). 3. Remove main harness plug (1) from light switch jack (2). 4. Measure resistance between main harness plug (1) pins K (3) and A (4) with both steering levers locked in parking brake position. 5. Does multimeter read 0 ohms? YES NO 4YN 1. Faulty main harness circuit 75A and/ or 75B. 2. Notify your supervisor. 5Y 1. Replace light switch (WP 0262 00). 2. Verify no faults found. 0038 00-2