so I buttoned up the "house" battery wiring project I started a few weeks ago.
It may look a bit messy but I promise you all the connections are soldered, heat shrunk, fused, and sealed up. There's just some wires that are longer than necessary, so after I give this a trial run over the next week or so, I plan to trim the wires down and neaten it up a bit so it looks a little more organized. But here it is:
Primary circuit breaker on the right side feeding the RedArc DC to DC charger, which is fused on both the input and output to the battery. Above the Redarc charger is the Victron BMV-712 Battery Monitor/Shunt. The battery will sit on the wood platform in front of those. The battery also feeds the blue sea systems 6 circuit fuse block above the jack. The yellow wire is the main 4ga fed from the solenoid mounted in the engine bay which is triggered via ignition hot to power up the DC to DC charger when the truck is running.

This is with the Battery in place using lashing straps and footman loops. On the far left is a Victron GlobalLink 520 which allows the BMV to connect to Victrons online web portal for monitoring and reporting of the battery health and SOC, etc. The GlobalLink comes with an LTE SIM card which has dedicated service included for 5 years with no monthly fees. The Battery monitor is sitting on top of the battery in the picture which will be mounted better shortly.
Mounted the Battery monitor panel against the back wall of the stock storage pocket. Only mod was to trim the pocket to clear the battery casing. I plan to plastic weld some plastic panels around the battery to close it in, so its not seen as easily.

Fuse block and circuit breakers are reachable by pulling the factory storage cubbies in the back just as if you were gaining access to the jack and tools.

All hidden and looks 100% stock from the outside. Pay no attention to how filthy it looks. I know I know it needs a good cleaning. But so far success. It's powering the ARB fridge and a couple USB ports on the right side. I'll add an additional USB port on this left side closer to the front so its reachable/useable by 3rd row passengers.
So now as it sits, the 100ah lithium house battery powers the fridge and USB charger ports. That battery is charged by the RedArc DC to DC charger (BCDC1250D) via an ignition controlled solenoid from the dual 180Amp alternators connected/wired just like the factory option.
In addition, I also wanted a way to keep the fridge on and keep the house battery charged while parked/camped, etc (ie. shore power). Since the RedArc did not offer an AC input I ended up using a 25Amp Victron IP67 Bluetooth controlled charger put into Power Supply Mode. This connects directly to the RedArc charger bypassing the solenoid. This allows the RedArc to charge/maintain the house battery in the back while keeping the fridge and USB ports powered up. To monitor the house battery I installed a Victron BMV-712 which utilizes a ground side shunt to monitor all power in/out of the house battery. This allows me to keep an eye on voltage, current and state of charge.
In addition I also wanted an onboard charger/maintainer for the Primary Start/engine batteries under the hood while parked/etc. So I also mounted a Noco Genius 10Amp single bank on board marine charger (fully submersible as well) to keep those batteries charged/fresh. I installed a Victron Battery Sense module to monitor the voltage of this primary battery bank as well.
I installed a Noco bumper mounted plug which connects both battery chargers as well as the factory block heater. I installed a waterproof switch on the block heater cord so I can keep that turned off until absolutely necessary. So now when parked/needed/etc I just connect a single extension cord to the plug mounted in the passenger corner of the front bumper.
The Victron Battery sense connected to the Primary truck batteries is connected via bluetooth to the BMV which monitors the House battery. The BMV is connected to the GlobalLink I mentioned above which allows me to monitor both battery banks remotely as long as there's LTE service where the Truck is.
Ok I think thats all for now. Time for dinner then need to clean up my mess and got everything organized back to where it belongs.