u/OptimalCan3870

So I have a 2021 Jeep Compass. The start/stop function stopped working, and following that the main battery started to get drained every morning. I replaced both batteries, but the start/stop still didn't work. It also kept saying the new auxiliary battery was dead and needed a charge. A few months went by alright, but that main battery is being drained again.

I tried just taking the auxiliary out entirely, but it wouldn't start or even turn on without the aux hooked up.

Any ideas what it might be?