Good afternoon,
You have what is called a parasitic draw the drains the battery overnight.
I attached a guide for you to follow.
https://www.2carpros.com/articles/car-battery-dead-overnight
You need to test the current flow from the battery. If it is too high, then you remove the fuses one by one until it comes down to 50-75 milliamps.
Once you find the fuse, let me know so I can get a diagram of the fuse and what it controls.
Roy
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Monday, November 16th, 2020 AT 2:34 PM