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possible parasitic drain

  1. LB7 Crank no Start

    06-07 LBZ & LLY Duramax Powertrain
    Current issue is my 03 Sierra sounds like its cranking strong but will never fire up. I had both batteries tested at the local parts stores and they tested good. I figured since the batteries tested good and wouldn't hold a charge it may be the alternator. It looked easy enough to get off so I...
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