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Charging System Test (NCB1)

  1. Turn off all electrical loads. Connect scan tool. Start engine. Using scan tool, observe IGNITION 1 (IGNITION 0 on Monte Carlo) voltage parameter in Powertrain Control Module (PCM) data list. If voltage is 11.0-15.5 volts, go to next step. If voltage is not 11.0-15.5 volts, check system for loose or poor connections.
  2. Turn ignition off. Connect a charging system tester to battery. Operate engine at 2500 RPM. Adjust carbon pile as necessary in order to obtain maximum current output. If current output is not 77-97 amps, go to next step. If current output is 77-97 amps, go to step  8.
  3. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Using a DVOM, measure voltage drop between generator output terminal and positive battery terminal. If voltage drop is less than 0.5 volt, go to next step. If voltage drop is more than 0.5 volt, go to step  5.
  4. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Using a DVOM, measure voltage drop between generator metal housing and negative battery terminal. If voltage drop is less than 0.5 volt, go to step  7. If voltage drop is more than 0.5 volt, go to step  6.
  5. Check for high resistance or open in Red wire between generator output terminal and positive battery terminal. See WIRING DIAGRAMS . If problem was found, repair as required and go to step  8. If problem was not found, go to next step.
  6. Repair high resistance or open in ground circuit of generator. See WIRING DIAGRAMS . Go to step  8.
  7. Replace generator. See GENERATOR  under REMOVAL & INSTALLATION.
  8. Operate system to verify repair.
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