Dbl. check all dome/glove box lights make sure you don’t have them on, I had a dome bulb that had pretty much burned itself down to a very faint glimmer, and it took a month to find that problem. I found it by shutting the garage door and a faint glimmer shown through.
Ground faults and such are hard to find on complex automotive systems,but it can be done. Just make sure its not something simple that you can handle or something you added into the system.
