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Test D: Generator Noise Diagnosis

  1. Using generator tester, test generator for proper operation. See TEST A: CHARGING SYSTEM TEST . If generator operates normally, go to next step. If generator does not operate normally, go to step  11.
  2. Start engine. Verify that generator noise can be heard. Turn ignition switch to OFF position. Disconnect 4-pin generator harness connector. Start engine. Listen for generator noise. If noise is still present, go to next step. If noise has stopped, go to step  11.
  3. Turn ignition switch to OFF position. Remove drive belt. Spin generator pulley by hand. If pulley rotates smoothly and no noise is present, go to next step. If pulley rotates roughly and/or noise is present, go to step  11.
  4. Inspect pulley for looseness, or loose pulley nut. If pulley and nut are okay, go to next step. If pulley and/or nut is loose, go to step  11.
  5. Loosen all generator mounting bolts. Tighten generator mounting bolts to specification. See TORQUE SPECIFICATIONS . Install drive belt. Start engine and listen for noise. If noise is still present, go to next step. If noise has decreased or stopped, system is okay.
  6. Check for stretched generator harness connectors, hoses or other equipment rubbing on generator. If problem exists, go to next step. If no problem exists, go to step  8.
  7. Reroute harness connections, hoses, etc., away from generator. Start engine and listen for noises. If noise is still present, go to next step. If noise has decreased or stopped, system is okay.
  8. Check drive belt for proper tension. If drive belt is loose, go to next step. If drive belt is okay, go to step  10.
  9. Replace drive belt tensioner. Start engine and listen for noise. If noise has decreased or stopped, system is okay. If noise is still present, go to step  11.
  10. Check comparable vehicle for similar noise. If noise is not present in similar vehicle, go to next step. If noise is present in similar vehicle, system is okay.
  11. If no definite generator problems were found, ensure all other possible sources of noise are eliminated. If all possibilities have been eliminated, replace generator. See GENERATOR . After repairs are made, go to next step.
  12. Operate system to verify repair. If condition was found and corrected, system is okay. If condition was not found, go to step  2.
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