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 INFRARED HEADLIGHT(S) DOES NOT OPERATE—Continued 0037 00 2Y 1. Turn MASTER SWITCH OFF. 2. Remove main harness plug (1) from beam selector switch jack (2). 3. Turn MASTER SWITCH ON. 4. Measure voltage between main harness plug (1) pin C (3) and ground. 5. Does multimeter read less than 17 volts? YES NO GO TO CY (PAGE 0037 00-5) 3Y 1. Turn MASTER SWITCH OFF. 2. Partially remove instrument panel (WP 0256 00). 3. Remove main harness circuit 514/515 (1) and 520 (2) from IR/ BO select switch jack(3) and IR/BO select switch jack(4). 4. Measure resistance between IR/BO select switch jack (3) and IR/ BO select switch jack (4). 5. Does multimeter read 0 ohms? YES NO 3YN 1. Install beam selector switch and main harness plug on beam selector switch. 2. Replace infrared-blackout select switch (WP 0263 00). 3. Verify no faults found. 0037 00-2