TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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6-3.2. 100 AMPERE ALTERNATOR (12342944) TESTING AND REPAIR (Cont’d) 8. Regulator Bypass Test. NOTE Perform this test only when instructed from tables 6-A and 6-A.1. (a) Prepare alternator as in Full-Load Test. NOTE Use jumper wire rated for 15 amps. (b) Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and short pin A of connector to ground momentarily. Record results. (c) Amperage should rise within ± 10% of rated output with jumper wire connected and fall with jumper disconnected. Refer to table 6-A.2 for diagnosis. 9. Turn test stand master power switch and load switch to OFF. 10. Disconnect jumper wires from terminals on test stand and alternator. 11. Remove V-belt from test stand pulley and alternator pulley. Remove alternator from test stand. CONNECT DISCONNECT DIAGNOSIS AMPS RISE AMPS FALL Alternator OK. See note. Replace regulator only if low AMPS/low VOLTS are indicated in table 6-A and/or table 6-A.1. NO CHANGE NO CHANGE Alternator must be repaired. Refer to Static Testing. Table 6-A.2. Regulator Bypass Test. TM 9-2320-280-34 Change 1 6-18.19