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Test D: Generator Noisy

  1. Test generator for proper operation. See TEST A: CHARGING SYSTEM TEST . If generator functions normally, go to next step. If generator does not function normally, go to step  12.
  2. Start engine. Verify that generator noise can be heard. Turn ignition switch to OFF position. Disconnect 4-pin harness connector from generator. Start engine. Listen for generator noise. If noise is still present, go to next step. If noise has stopped, go to step  12.
  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  12.
  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  12.
  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 or strained generator harness connections, or hoses or other equipment rubbing on generator. If problem exists, repair as necessary and then go to next step. If no problem exists, go to step  8.
  7. Reroute electrical 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. See appropriate article in ENGINES. Start engine and listen for noise. If noise has decreased or stopped, system is okay. If noise is still present, go to step  12.
  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  under REMOVAL & INSTALLATION. After repairs are made, 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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