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Test D: Generator Noise Test

  1. Test generator for proper operation. See TEST A: CHARGING SYSTEM TEST  . If generator is operating properly, go to next step. If generator is not operating properly, go to step  13 .
  2. Start engine. Verify that generator noise can be heard. Turn engine off. Disconnect 3-pin harness connector from generator. Start engine. Listen for generator noise. If noise has not stopped, 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  13 .
  4. Inspect pulley for looseness, or loose pulley nut. If problem exists, go to next step. If no problem exists, go to step  7 .
  5. Remove generator pulley. Inspect pulley and shaft for damage or signs of overheating due to slipping pulley. If no problem exists, go to next step. If problem exists, go to step  13 .
  6. Install generator pulley. Tighten pulley nut to 48 ft. lbs. (65 N.m). Install drive belt. Start engine. If noise is still present, go to next step. If noise has decreased or stopped, system is okay.
  7. 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.
  8. Check for stretched generator harness connections, hoses or other equipment rubbing on generator. If problem exists, go to next step. If no problem exists, go to step  10 .
  9. Reroute harness connectors, 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.
  10. Check drive belt for proper tension. If drive belt is loose, go to next step. If drive belt is okay, go to step  12 .
  11. Adjust drive belt tension. See BELT TENSION  under ADJUSTMENTS. Start engine. If noise is still present, go to next step. If noise has decreased or stopped, system is okay.
  12. 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.
  13. 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.
  14. If condition has been corrected, test is complete. If condition has not been corrected, go to step  2 .
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