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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1912 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Generator Noise Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine, verify the noise can be heard. Compare the concern to a similar vehicle.
  2. Inspect the generator, generator mounting, wiring harness, heater hoses, A/C lines or other accessory equipment that may be misrouted or be the cause of noise being transmitted into the passenger compartment.
  3. Ignition OFF, remove the engine drive belt. Verify the generator, idler pulley and tensioner pulley spin freely.
    • If any of the pulleys do not spin freely, replace the affected component.
  4. Loosen all generator mounting bolts and ensure the generator is properly aligned. Tighten mounting bolts to specification. Refer to Generator Replacement (LZ4)  or Generator Replacement (LE5)  or Generator Replacement (LY7) .
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