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  1. Help with Alternator whine! BMW M5

    Technical & Advanced Car Audio Discussion
    Please help me diagnose and correct this alternator whine. I am somewhat of a noob, so please be gentle....... Car: 2001 BMW M5, battery is in the trunk Setup: Kenwood DNX9980HD (double din GPS, top of the line a year or so ago, recently bought used for a reputable person), JL HD900/5...