TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 200 AMP OVER VOLTAGE TROUBLESHOOTING (M548A3)—Continued 0027 00 Y 1. Remove six screws (1) and cover (2) from 200 amp voltage regulator (3). 2. Connect multimeter to clean unpainted surface and vehicle ground. 3. Does multimeter read 0.5 ohms or less? YES NO YN 1. Ensure lock washers (1) and screws (2) are tight on plate (3). 2. Tighten nut (4) securing ground lead (5) to 200 amp voltage regulator (6). 3. Install cover and screws on 200 amp voltage regulator. 4. Repeat charging system operational check (WP 0024 00). 2Y C A U T I O N If voltage climbs above 33 or more volts, shut off engine. Generator could be damaged. 1. Install cover and six screws on 200 amp voltage regulator. 2. Connect generator test kit. 3. Check batteries to make sure they are fully charged (see TM 9-6140-200-14. 4. Turn off all electrical equipment/loads. 5. Adjust rheostat to maximum resistance. 6. Connect diagnostic test harness leads 1 and 4 together. 7. Start engine (see your -10) and run at 800 rpm and lower resistance. 8. Does voltage rise above battery voltage (test harness lead 3 to ground) to approximately 28 volts? YES NO 2YN 1. Remove generator test kit. 2. Replace 200 amp generator (WP 0246 00). 3. Repeat charging system operational check (WP 0024 00). 3Y 1. Remove generator test kit. 2. Replace 200 amp voltage regulator (WP 0251 00). 3. Repeat charging system operational check (WP 0024 00). 0027 00-2