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high voltage

  1. Charging system @ 18V after alternator replacement - no low beams or high beams

    Cadillac STS Forum 2005 through 2012
    I replaced my alternator in my 2006 STS about a week ago. Since then I have been getting a high voltage warning on my dashboard, around 18+. All my accessories power off during this time. Finally about 7-10 min later voltage goes back to normal around 13V, and all my accessories turn back on. I...