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Test D: Generator Noise Diagnosis: Testing

  1. Test generator for proper operation. See TEST A: CHARGING SYSTEM TEST  . Is the generator operating properly? If so, go to next step. If not, go to step  11 .
  2. Start engine. Verify that generator noise can be heard. Turn ignition switch to LOCK position. Disconnect generator harness connector. Start engine. Listen for generator noise. If noise has stopped, go to step  11 . If noise is still present, go to next step.
  3. Turn engine off. 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 step  11 . If pulley and/or nut is loose, repair as necessary and go to next step.
  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 has decreased or stopped, system is okay. If noise is still present, go to next step.
  6. Check for stretched generator connections, or hoses or other equipment rubbing on generator. If problem exists, 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 is still present, 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 is still present, go to step  11 .
  10. Check comparable vehicle for similar noise. If noise is present in similar vehicle, system is okay. If noise is not present in similar vehicle, go to next step.
    NOTE: If no definite generator problems were found, be sure that all other possible sources of objectionable noise are eliminated before replacing the generator. Replacing the generator may not change the noise level if the noise is a normal characteristic of the generator or the generator mounting.
  11. Replace generator. See GENERATOR  under REMOVAL & INSTALLATION. Has the noise decreased or stopped? If so, go to next step.
  12. Operate the system in order to verify the repair. Did you correct the condition? If so, then system is okay. If not, go to step  2 .
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