LEMON Manuals: Even more car manuals for everyone
Home >> Isuzu >> 2000 >> Hombre S, 4.3 W >> Repair and Diagnosis >> Electrical >> Charging Systems >> Generators & Regulators >> System Tests >> Generator Not Operating Properly

Generator Not Operating Properly

NOTE: Use Electronic Generator Tester (J-41450-B) to perform following test procedure.
  1. Perform CHARGING SYSTEM CHECK  before proceeding. If no problem was found, go to next step.
  2. Connect Red alligator clip of generator tester to generator output terminal. Connect Black alligator clip to ground. If generator tester Green POWER light comes on, go to step  9 . If Green light does not come on, go to next step.
  3. Inspect alligator clips to ensure that they are connected as instructed in previous step. If Green light now comes on, go to step  9 . If Green light still does not come on, go to next step.
  4. Connect a DVOM between generator output terminal and generator housing. If measured voltage is above 12 volts, go to step  18 . If measured voltage is 12 volts or less, go to next step.
  5. Use DVOM to measure battery voltage between positive and negative terminals. If measured voltage is above 12 volts, go to next step. If measured voltage is 12 volts or less, go to step  8 .
  6. Check for a faulty circuit between generator output terminal and battery positive terminal. Check for open fusible link or blown fuses. If fusible link is open, check for a short to ground in electrical system. Repair any other problems that were found. If fuses, fusible links and wiring are okay, go to next step.
  7. Repair poor ground circuit between generator housing and negative battery terminal. Go back to step  2 .
  8. Check for discharged or defective battery. Recharge and retest if necessary. After recharging or replacing battery, go back to step  2 .
  9. Leave generator tester connected as in step  2 . Disconnect 4-wire generator electrical connector. Connect generator tester 4-wire test connector into generator. If Red light on generator tester comes on, go to step  11 . If Red light does not come on, go to next step.
  10. Disconnect 4-wire test connector from generator, but leave alligator clips connected as in step  2 . Using Connector Test Adapter Kit (J-35616-A), connect a Metri-Pack 150 male terminal to a 100-ohm resistor on one end, and a length of jumper wire on the other end. Plug male terminal into generator tester "B" terminal. Connect other end of jumper wire to battery negative terminal. If Red light on generator tester comes on, go to step  19 . If Red light does not come on, go to step  18 .
    CAUTION: Make sure that carbon pile load tester load dial is completely turned to OFF before connecting it to battery.
  11. Connect a carbon pile load tester to battery terminals. Connect an inductive ammeter to generator output leads, making sure that all output leads pass through inductive pickup. Start engine and allow it to idle. If Red light on generator tester comes on, go to step  19 . If Red light does not come on, go to next step.
  12. Increase engine speed to 2500 RPM. If Red light on generator tester comes on, go to step  19 . If Red light does not come on, go to next step.
  13. Maintain 2500 RPM and turn on carbon pile tester load. Increase load until generator output equals 70-73 amps. If generator is capable of producing specified amperage, go to next step. If generator is not capable of producing specified amperage, go to step  19 .
  14. Maintain 2500 RPM, and maintain carbon pile tester load. If Red light on generator tester is lit, go to step  19 . If Red light is not lit, go to next step.
  15. Maintain 2500 RPM, and maintain carbon pile tester load. Connect a DVOM between generator output terminal and battery positive terminal. If voltage is above .5 volts, go to step  21 . If voltage is .5 volts or less, go to next step.
  16. Maintain 2500 RPM, and maintain carbon pile tester load. Connect a DVOM between generator housing and battery negative terminal. If voltage is above .5 volts, go to step  23 . If voltage is .5 volts or less, go to next step.
  17. Disconnect DVOM. Turn carbon pile load tester OFF. Turn ignition off. Disconnect carbon pile tester. Disconnect generator tester. Inspect generator electrical connector to determine if a wire is plugged into "B" terminal cavity. If a wire is present, generator is okay. If no wire is present, go to step  24 .
  18. Generator tester is faulty. Replace tester and go back to step  2 .
  19. Disconnect and inspect generator electrical connector to determine if a wire is plugged in to "B" terminal cavity. If a wire is present, go to next step. If no wire is present, go to step  24 .
  20. Disconnect generator 4-wire connector. Turn ignition switch on. Using a Metri-Pack 150 connector test adapter, connect a 5-amp fused jumper wire to generator connector terminal "B" to ground. If fuse blows, go to next step. If fuse does not blow, go to step  25 .
  21. Repair short to voltage in "B" terminal circuit. See WIRING DIAGRAMS  . Go to step  25 .
  22. Turn engine off and disconnect negative battery terminal. Locate and repair high resistance in wiring or connectors between battery positive terminal and generator output terminal. See WIRING DIAGRAMS  . Reconnect negative battery terminal. Go back to step  2 .
  23. Turn engine off. Locate and repair high resistance between battery negative terminal and generator housing. Go back to step  2 .
  24. Disconnect generator 4-wire electrical connector. Use DVOM to measure resistance between generator "B" and "C" terminals (2 middle terminals). If resistance is 500 ohms or less, system is okay. If resistance is greater than specified, go to next step.
  25. Replace generator. Go back to step  2 .
scientia non olet · About LEMON Manuals