See this guide below, and watch the YouTube videos on how to properly test for parasitic drain on a battery. Hopefully this will help you find your drain.
Good luck!
There are plenty of YouTube Videos if you search which shows how to check for parasitic drain on a vehicle's battery.
Here are a couple samples:
https://www.youtube.com/watch?v=lRcj1fQ ... FmUQ%3D%3Dhttps://www.youtube.com/watch?v=jnQ3qCY ... FDWQ%3D%3DTest for Parasitic Battery DrainPage 1
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