TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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TM 9-2320-280-34 6-18.32 Change 1 Table 6-A.3. No-Load Test. Table 6-A.4. Full-Load Test. AMPS 28 VDC 14 VDC DIAGNOSIS 81-100 21-25 10.5-12.5 Test bench battery is discharged (or defective). Allow to charge (or replace). 81-100 26-30 13-15 Give time to stabilize while monitoring VOLTS. If VOLTS rise above normal range (26-30 volts), regulator and/or tube assembly must be replaced. If AMPS fall, charging system is OK. 81-100 31-35 15.5-17.5 STOP TEST. Regulator and/or tube assembly must be replaced. Refer to static testing, task c. 40-59 21-25 10.5-12.5 Alternator and/or regulator must be repaired or replaced. Refer to table 6-A.6. 40-59 26-30 13-15 Regulator OK. Refer to table 6-A.4. 40-59 31-35 15.5-17.5 STOP TEST. Test bench malfunction or wiring error. AMPS 28 VDC 14 VDC DIAGNOSIS 81-100 21-25 10.5-12.5 Test bench battery is discharged (or defective). Allow to charge (or replace). 81-100 26-30 13-15 Charging system OK. 81-100 31-35 15.5-17.5 STOP TEST. Regulator and/or tube assembly must be replaced. Refer to static testing, task c. 40-59 21-25 10.5-12.5 Alternator and/or regulator must be replaced. Refer to table 6-A.6. 40-59 26-30 13-15 Increase load. 40-59 31-35 15.5-17.5 STOP TEST. Test bench malfunction or wiring error. NOTE • When tachometer reaches 3000 rpm, green lamp should go off indicating proper charging from alternator. • Normal voltage range is 26-30 VDC. High amperage is +10 percent over the rated alternator output of 81 amps at 5000 rpm. 9. Perform full-load test. Ensure all load switches are in ON position on 500-amp test stand, and increase alternator speed to 5000 rpm. Set load to 81 amps/min; record results. Refer to table 6-A.4, Full-Load Test, for diagnosis. 6-3.3. 100 AMPERE DUAL VOLTAGE ALTERNATOR (12447110) TESTING AND REPAIR (Cont’d)