I'm hoping someone out there has some good info about the issues I'm experiencing.

2018 Ram 2500 Laramie Mega Cab, daily driven.

When I start in the afternoon to go to work, it's fine.

After it sits for roughly 12 hours when I start (both auto and key) I usually get a Battery Saver Mode warning and none of my beloved heated stuff will turn on.

Sometimes this includes most of the buttons on the touch screen.

If I shut off and re-start, it will either be fine or if the touch screen button weren't grayed out, they will be.

A third re-start usually gets me out of BSM and gets my heated seats and touch screen buttons working.

Dash reads 13V, drops to 11V when the grid heater fires.

OEM batteries were replaced because of this, less than 6 months ago, currently stuck with Optima Red Tops.

Oil and block heater plugged in except to troubleshoot the issue.

Nothing plugged in or turned on in the pickup.

Not willing to pay the dealership for diagnosis just to hear "wE DoN'T kNoW wHaT's WrOnG" or "We can get to it in about 3 months".

Don't have any respectable/experienced diesel shops anywhere near here that I'm aware of.

I'm about to get AllDataDIY and daily the Jeep while I tear into this thing and start replacing stuff.