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. 2004MPERE DUAL VOLTAGE ALTERNATOR TESTING AND REPAIR (Cont’d) I I I 12. Alternator speed and current output tracking values. Refer to table 18-3. Table 18-3. Alternator Speed and Current Dacking. ALTERNATOR 28VDC 14vDc ALTERNATOR _ 28vDc 14vDc SPEED OUTPUT CURRENT OUTPUT CURRENT SPEED OUTPUT CURRENT OUTPUT CURRENT (RPM) k5AMP MINIMUM AMP (RPM) +5 AMP MINIMUM AMP *0 34 105 27 4 33 2,000 120 12 1,200 20 17 **132 0 30 7 *0 23 **37 0 14 50 *0 40 3,000 110 50 6 50 130 30 1,500 50 40 150 10 **160 60 0 30 *0 10 74 16 5,000 15 50 **go 0 TO 140 50 *0. 31 8,000 165 25 2,000 8 50 180 10 90 42 **190 0 * Dependant on ammeter location in test circut. ** Minimum acceptable current with no load on 14 VDC system. 13. Perform regulator bypass test. Prepare alternator as in full-load test. NOTE l Perform this test only when instructed from tables 18-1 and 18-2. l Use jumper wire rated for 15 amps. 14. Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and short pin A to ground momentarily. Record results. 15. Amperage should rise within f 10 percent of rated value with jumper wire connected, and fall with jumper disconnected. Refer to table 18-4 for diagnosis. 16. Turn test stand master power switch and load switch to OFF. 17. Disconnect jumper wires from terminals on test stand and alternator. 18. Remove belt from test stand pulley and alternator pulley. Remove alternator from test stand. Table 18-4. Regula or Bypass Test. CONNECT I DISCONNECT DIAGNOSIS -7 AMPS RISE AMPS FALL NO CHANGE NO CHANGE Alternator OK See note. Replace regulator only if low AMPS (80-119YIowVOLTS (21-25) are indicated in table 18-1 and/or table 18-2. Alternator must be repaired. Refer to static testing, task c. 18-S