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Test D: Generator Noise Diagnosis

  1. Perform charging system check. See TEST A: CHARGING SYSTEM TEST  . If generator operates properly, go to next step. If generator does not operate properly, go to step  11 .
  2. Start engine. Verify that generator noise can be heard. Turn ignition switch to OFF position. Disconnect generator 4-pin harness connector. Start engine. Listen for generator noise. If noise does not exist, go to step  11 . If noise exists, go to next step.
  3. Turn ignition switch to OFF position. Remove drive belt. Spin generator pulley by hand. If pulley rotates smoothly and noise does exist, go to next step. If pulley rotates roughly and/or noise exists, 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 bolts to 37 ft. lbs. (50 N.m). Install drive belt. Start engine and listen for noise. If noise has decreased or stopped, system is okay. If noise still exists, go to next step.
  6. Check for stretched generator connections, or hoses or other equipment rubbing on generator. If problem exists, repair as necessary. After repair, go to next step. If problem does not exist, go to step  8 .
  7. Reroute electrical connections, hoses, etc., away from generator. Start engine and listen for noises. If noise has decreased or stopped, system is okay. If noise still exists, go to next step.
  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 still exists, go to step  11 .
  10. Check comparable vehicle for similar noise. If noise exists in similar vehicle, system is okay. If noise does not exist in similar vehicle, go to next step.
  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 repair, go to next step.
  12. Start engine and verify that noise is reduced or eliminated. If noise is still objectionable, go to step  2 .
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