2014 Tesla Model S P85D 12V battery has gone dead. Car dead. This car is unsupported by Tesla. Here's my story: Drove through a medium sized maybe 8" deep rain puddle. A few seconds later as I was driving i received a warning on the screen "Immediate Service", "12 volt battery". Drove 5 miles more to home and parked. Next morning 12 volt battery dead. Replaced battery, but got additional warnings, "reduced power", "car may not start", also heater and AC didn't come on. I read through threads on this form about dc to dc converter having bad fuses, so thats were I started. I retrieved the converter only after 6 hours of knuckle slicing agony to find out mine doesn't require fuses. this 2014 is a late manufacture date and is a third generation type. I guess the DC to DC converter could still be bad, but I don't want to start just swapping parts. Is there a way to bench test this unit? Am I looking in the wrong direction? I am assuming the main fuse and conductors in the battery are good because I was not left stranded on the road Any input is appreciated. Thank you!