TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download
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TM 9-2320-387-24-2 1 18-3. 200~AMPERE DUAL VOLTAGE ALTERNATOR TESTING AND REPAIR (Cont’d) 1 CAUTION Ensure auxiliary measuring equipment is properly grounded to test stand. Failure to do so may lead to erroneous readings or damage to equipment. NOTE Prior to operation of test stand, ensure all switches and controls are in initial positions as referenced in Operator and Maintenance Manual, TM 9-4910-663-12 (UMC Model GSAR-5001, or Operator and Maintenance Manual, TM 9-4910-485-12 (Sun Model AGT-99A). 7. Set 500-amp test stand as follows: Model GSAR-500 Model AGT-99A (a) DC ammeter load and starter selector x10 500 amp (b) DC ammeter field and battery charge selector Xl 5 amp (cl Field circuit switch Regulator Regulator (d) DC voltmeter circuit selector RECT/GEN RECT/GEN (e) Connect DC voltmeter (0-5OVDC) from point between regulator 14 VDC output and load in 14 volt circuit (or 14 volt battery). (0 Connect ammeter (O-75ADC) in load line from 14 V regulator to 14 V load. 8. Turn 500-amp test stand master power switch and master load switch to ON, and turn battery switch to 24 VDC. Green lamp on 500-amp test stand must illuminate. 9. Perform no-load test. Set test stand battery circuit selector to 24 VDC, IGN switch to ON, and start varidrive. Observing the DC voltmeter output voltage and tachometer rpm, increase speed until tachometer reads 5,000 rpm. Record voltmeter reading and refer to table 18-1 for diagnosis. 28V VEH B+ IGN ALT/REG 14v ALTERNATOR/REGUlATOR 1 14v B+ \ ALT/REG 28V 18-3