TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
Page 364 of 1258
6-5. 200 AMPERE ALTERNATOR (12338796-1) TESTING AND REPAIR (Cont'd) Table 6-A.7. No-Load Test. Table 6-B. Full-Load Test. AMPS VOLTS DIAGNOSIS 161-200 21-25 Test bench battery is discharged (or defective). Allow to charge (or replace). 161-200 26-30 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 systems OK. 161-200 31-35 STOP TEST. Regulator and/or tube assembly must be replaced. Refer to Static Testing. 80-119 21-25 Alternator and/or regulator must be repaired or replaced. Refer to table 6-C. 80-119 26-30 Regulator OK. Refer to table 6-B. 80-119 31-35 STOP TEST. Bench malfunction or wiring error. AMPS VOLTS DIAGNOSIS 161-200 21-25 Test bench battery is discharged (or defective). Allow to charge (or replace). 161-200 26-30 Charging system OK. 161-200 31-35 STOP TEST. Regulator and/or tube assembly must be replaced. Refer to Static Testing. 80-119 21-25 Alternator and/or regulator must be replaced. Refer to table 6-C. 80-119 26-30 Increase load. 80-119 31-35 STOP TEST. Test bench malfunction or wiring error. TM 9-2320-280-34 Change 1 6-39 7. Perform no-load test. Increase alternator speed to 5000 rpm; record results. Refer to table 6-A.7, No-Load Test, for diagnosis. 8. Perform full-load test. Set all load switches on 500 amp test stand to “ON” and increase alternator speed to 5000 rpm. Set load to 182 amps min.; record results. Refer to table 6-B, Full-Load Test, for diagnosis. 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% over the rated alternator output of 182 amps (@ 5000 rpm).