Update: I checked the wiring under the steering wheel and immediately noticed the floorboards on both the driver and passenger side were pretty soaked. The rear floor was dry though. When I parked in the rain it was parked on a decline (nose down). Also checked the fuse box in the engine bay and the wiring box next to the battery. Both of these looked bone dry and checked a few fuses and they looked good.

The wiring under the steering wheel looked dry from just a very very basic inspection, didn't see anything that looked wet. I'll need to read the manuals some more to better understand the wiring. Right now everything under there just looks like a cob of confusing webs I want to unplug some of those connectors and inspect them.

I also need to determine how the floorboards got wet. Looked through some other posts of people with water in the interior. Sounds like a leak, clogged drain hole....any number of possible culprits.

 

Does your 8 have a sunroof? There’s threads here regarding blocked drain holes that result in water tracking down the A pillars. Mine doesn’t have a sunroof but, had water coming in through the door drain holes. Door drains probably not related to your electrical issues so try checking out sunroof drain hole threads.

 

Hey Meat Head, yea it does have a sunroof. Thanks, I'll look at those threads closer. I also have one of the service manuals that might show more details about them. I didn't realize there were RX-8's that came without sunroofs!