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Test B: Generator Noise Diagnosis

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  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  11 .
  2. Start engine. Verify that generator noise can be heard. Turn switch to OFF position. Disconnect generator 4-pin harness connector. Start engine, and 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 no noise exists, 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 problem does not exist, go to next step. If problem exists, go to step  11 .
  5. Loosen all generator mounting bolts. Tighten generator bolts to specifications and in sequence. See TORQUE SPECIFICATIONS  . Install drive belt. Start engine and listen for noise. If noise does not exist, system is okay. If noise 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.
  7. Reroute harness connections, hoses, etc., away from generator. Start engine and listen for noises. If noise has decreased or stopped, system is okay. If noise has not decreased or stopped, 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. See DRIVE BELT TENSIONER  under Removal & Installation. 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 exists in similar vehicle, system is okay. If noise does not exist in similar vehicle, go to next step.
    11. NOTE: If no definite generator problems were found, ensure all other possible sources of noise are eliminated. Replacing generator may not change noise level, if noise is normal characteristic of generator or mountings.
  11. Replace generator. See GENERATOR  under REMOVAL & INSTALLATION. After repair, go to next step.
  12. Operate vehicle to verify repair. If system is not operating correctly, repeat test beginning at step  2 .
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