TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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TM 9-2320-280-34 Change 1 6-44.5 6-5.1. 200 AMPERE DUAL VOLTAGE ALTERNATOR (12447109) TESTING AND REPAIR (Cont'd) CONNECT DISCONNECT DIAGNOSIS AMPS RISE AMPS FALL Alternator OK. See note. Replace regulator only if low AMPS (40-59)/low VOLTS (21-25) are indicated in table 6-D and/or table 6-E. NO CHANGE NO CHANGE Alternator must be repaired. Refer to static testing, task c. Table 6-G. Regulator Bypass Test. NOTE • Perform this test only when instructed from tables 6-D and 6-E. • Use jumper wire rated for 15 amps. 12. Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and short pin A to ground momentarily. Record results. 13. Amperage should rise within ± 10 percent of rated value with jumper wire connected, and fall with jumper disconnected. Refer to table 6-G for diagnosis. 14. Turn test stand master power switch and load switch to OFF. 15. Disconnect jumper wires from terminals on test stand and alternator. 16. Remove belt from test stand pulley and alternator pulley. Remove alternator from test stand. ALTERNATOR 28 VDC 14 VDC SPEED OUTPUT CURRENT OUTPUT CURRENT (RPM) ±5 AMP MINIMUM AMP *0 26 4 33 1,200 20 17 30 7 **37 0 *6 40 50 40 1,500 60 30 74 16 **90 0 *0 20 2,000 8 40 90 42 105 27 ALTERNATOR 28 VDC 14 VDC SPEED OUTPUT CURRENT OUTPUT CURRENT (RPM) ±5 AMP MINIMUM AMP 2000 120 12 132 0 8 23 110 50 3000 130 30 150 10 160 8q *0 8 5000 8 10 to 140 40 8000 165 25 180 10 190 0 Table 6-F. Alternator Speed and Current Tracking. *Dependent on ammeter location in test circuit. **Minimum acceptable current with no load on 28 VDC system.