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The first thing I would start with, is remove the remote start that best Buy has installed. No offense but usually theses are untrained low paid non professionals and hopefully they didnt damage your factory wiring. Then I would take it to a qualified electrical technician and have the alternator and charging system retested as it just could be a faulty alternator as the regulator comes with it as an assembly. If it does turn out to be the alternator assembly , I would spend the extra money to have a train professional install your remote start. And the Alternator should be covered under warrenty.