TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 REFERENCE INFORMATION ALTERNATOR Change 1 2-223 NOTE For 60 amp Prestolite alternator, go to B, page 2-204. For 100 amp Prestolite alternator, go to C, page 2-208. For 200 amp Prestolite alternator, go to D, page 2-212. For 200 amp single voltage Niehoff alternator, continue with E. For 100 amp single voltage Niehoff alternator, continue with F. For 100 amp dual voltage Niehoff alternator, go to F.1, page 2-224.2. For 200 amp dual voltage Niehoff alternator, go to G, page 2-224.6. For 400 amp dual voltage Niehoff alternator, go to H, page 2-224.10. NOTE The regulator for this model alternator has overvoltage protection. Any output voltage over 30.5 volts is an overvoltage. Output voltage of 25-30.5 is acceptable for this alternator. 1. Start Test 10, Engine RPM. 2. Crank or start the engine. Displayed reading is RPM. Engine RPM should be 1200 - 1500. ENGINE RPM STE/ICE-R TEST 10 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. 2. Start Test 89, DC Volts. 3. Displayed reading is in volts. 0-45 DC VOLTS STE/ICE-R TEST 89 NOTE Voltage on wire 568 signals regulator to turn on. Without voltage, regulator can’t operate. Wire 568A is connected with wire 5A inside engine wire harness. If there is no loose end on wire 568A, wire harness repair is required.