power drain

Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. If your "new" battery and alterantor test "good" - meaning - the battery can sustain a charge and the alterantor is putting out proper voltage and amperage, then I would start looking for a possible "parasitic draw". This means something might be staying electrically energized while the vehicle is turned off. Testing procedures are required to determine if there's a draw occurring. This is all guesswork based off your description of concern; the best thing to do is reach out to a shop near you for guidance. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!