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Test F: Generator Noisy

  1. Check For Accessory Drive Noise & Mounting Brackets

    Turn ignition off. Check the accessory drive belt for damage and correct installation. Check the accessory mounting brackets and generator pulley for looseness or misalignment. Is the accessory drive okay? If yes, go to next step. If no, repair as necessary. Test the system for normal operation.

  2. Check Generator For Excessive Electrical Noise

    Disconnect generator 3-pin harness connector. Start engine. With the engine running, determine if the generator is still noisy. Is the noise still present? If yes, go to next step. If no, install a new generator. See GENERATOR  under REMOVAL & INSTALLATION. Test system for normal operation.

  3. Check Generator For Mechanical Noise

    Turn all the accessories off. With the engine running, use a stethoscope or equivalent listening device to probe the generator for unusual mechanical noise. Is the generator the noise source? If yes, install a new generator. See GENERATOR  under REMOVAL & INSTALLATION. Test system for normal operation. If no, diagnose the source of the engine noise.
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