After many weeks scratching my head on why my battery is dead in 2 days, I finally bought a multi meter. Did the works, charged the battery, killed the door lights with grip clamps, and checked amp draw.

.14 amps.

I started pulling fuses and the last fuse I pulled killed the draw. Checked the fuse box diagram: "room fuse." Did a quick search online and it seems I am not the first to encounter the issue and I hear it's a PITA to find the source of drain in the circuit. I found a wiring diagram but don't see the fuse listed anywhere in the diagram so that I can trace which wires I am looking for. It just has listed a bunch of numbers like 0914-A but I don't see any place where it traces these numbers to a particular fuse.

 

well these are the two threads I would direct someone to who didn’t search, which the Room Fuse is indicated in the wiring diagram I posted in the one thread, later in the thread it discusses how there are a lot of things on that circuit; essentially the entire cabin. Generally speaking these draws seem to be related to keyless entry, stereo, or security systems, but a few others are discussed. That still doesn’t explain the alternator voltage dropping out under certain conditions that you mentioned by PM. I would generally also recommend an actual wiring diagram for your specific model year rather than the online pdf, which is an early pre-production document. There are some variations over model years. Good luck.

https://www.rx8club.com/series-i-tro...p-draw-265596/

https://www.rx8club.com/rx-8-discuss...le-off-237422/