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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Battery, Starting System And Charging System) >> Diagnostic Information and Procedures >> Generator Noise Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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. Perform a charging system test. Verify that the generator is charging properly.
  3. 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.
  4. Ignition OFF, remove the engine drive belt. Verify the generator, A/C compressor, water pump pulley, power steering pump, idler pulley, and tensioner pulley spin freely.
    • If any of the pulleys do not spin freely, replace the affected component.
  5. Start the engine, with the drive belt removed. Verify that the noise goes away. Operate the engine for no longer than 30-40 seconds.
    • If the noise is still present, the generator is not the cause of the noise.
  6. Loosen all generator mounting bolts and ensure the generator is properly aligned. Tighten the mounting bolts to specification, refer to Generator Replacement (LWN) Generator Replacement (L96, LC8) Generator Replacement (LV1 with K68) Generator Replacement (LV1 with KW5/KG4) .
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