Replaced battery, starter and checked all spark plugs car won’t start and drains every battery why?

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. Sounds like there could be a parasitic draw causing the battery to discharge repeatedly. Electrical testing should be performed to see if the battery is still having power drawn from it even though everything is "off". Once you see there is a draw, then you need to remove fuses from the fuse box until the draw goes away. When it does, you know what circuit to be looking at for your draw. Hands on testing from a shop near you is needed. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.