Seventeen days ago my 2013 Sonata died. Oreily tested battery good. My mechanic tested alternator bad. Bought a new alternator and it died next day. OREILY replaced, lifetime warranty, and two weeks later, car died. Replaced alternator again. Had shop check grounds. Ok. I'm doubting 3 alternators would fail in two weeks? I'm not a mechanic. What's the cause?