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Test D: Generator Noise Diagnosis

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. 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 engine off. Disconnect 4-pin connector from generator. 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 next step. If pulley and/or nut is loose, go to step  11 .
  5. Loosen all generator mounting bolts. Tighten all bolts to specification. See GENERATOR  under REMOVAL & INSTALLATION. 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 condition is found, go to next step. If condition(s) were not found, 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. 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  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.
  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. 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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