Thanks for all the comments everyone, I will certainly try as much of this as i can. If i can't find the issue, I'll start calling around local mechanics with the specific issue and really emphasize the draw/electrical/fuse/testing will be needed to solve the problem.
Aftermarket radio/backup camera is the only thing i have non-OEM. They were installed at the same time, and all 3 places i've taken it have determined those are not causing it. We disconnected them and the battery still had a draw.
Thanks for the advice though, I may have to do that in...
Well that's the thing that makes it more difficult, i have virtually zero mechanic skills or tools. I'm relying on my local Toyota specialist (who is excellent BTW and have been in business for 20+ years, I use them for everything), and I also tried the Toyota dealer. Neither can figure it...
As far as i know everything electrical works. I think the 12V may not work actually but that hasn't worked in years, well before this problem.
Nothing else that is aftermarket.
I have a 2007 4runner that i bought in 2010, has about 140K miles and I was planning to drive it to at least 300k.
In the last 6 months something has begun to draw against the battery when the car is off. I've replaced the alternator and gone through 3 new batteries. I've taken the car to...