Some install/tech manual links I came across while searching for 12V amp usage of appliances(frig door heaters). Don't know if all apply to our RVs.

AIR CONDITONER - Atwood Rooftop Ducted Air Conditioner
Install & Operation
Atwood AirCommand Install & Operation - p5 Molex SPCC - GDRV 4-2012.pdf

Service - Troubleshooting
Atwood Roof AC Repair Service Manual rev13 10-2013.pdf

FURNACE - Atwood Hydro Flame Furnace
Atwood Hydro Flame Furnace Service Manual 2004.pdf

WATER HEATER - Atwood DSI
Atwood-Water-Heater-Service Manual 2004.pdf

ATWOOD MOBILE
Atwood-Mobile-Service-Training-Manuals-2007.pdf


NORCOLD
1210 Frig Series
Norcold 1210 Service Rev 8-2007
Norcold 1210 Series Rev 2-2007
Norcold 1210 Series Rev 2-2010 Scanned


Links
http://bryantrv.com/docs.html
https://www.rexandsonsrvs.com/rv-service-manuals-rv

Gene