New to me 1979 Dodge Fireball

Batteries on neighbor kid's rig is in a compartment similar to a truck campers. Has room for two 12 volt or six volt batteries.

DrewE wrote:
Precise schematics may very well not exist.

Most RVs have pretty similar and generally reasonably straightforward wiring and plumbing systems, with only a few variants in places. Generic information should be sufficient to get you on the right track, and from there it's "just" tracing wires to see what goes where.

Briefly, you have two basically distinct electrical systems in the house part (besides the vehicle chassis electrical system): a 12V DC system, and a 120V AC system. The two meet at the converter, a sort of built-in battery charger and 12V power supply for use when on shore power. The 12V system powers the lights, ceiling vent fans, furnace, water heater controls (if it's not a pilot ignition model), fridge controls (if applicable), water pump, etc. The 120 V AC system powers the air conditioner, the AC heating element for the fridge, and the convenience outlets, the microwave if you have one, and maybe a few other odds and ends.

If you're gutting it, probably the best plan is to rip out the old wiring and install new. Some of the components may be worth salvaging and reusing (appliances in particular). The converter, if original, is only worth saving if you need something to keep a door from closing or a boat from drifting away.

x2, absolutely ! Make it a better than new 1979 :C

look into a Truma hot water system , see if that appeals to your needs.
Maybe some solar to support a 12v compressor style fridge so you do not have to be level all the time.
Design it to support an interior Lithium battery bank so you can keep them at room temp. during cold weather.

Precise schematics may very well not exist.

Most RVs have pretty similar and generally reasonably straightforward wiring and plumbing systems, with only a few variants in places. Generic information should be sufficient to get you on the right track, and from there it's "just" tracing wires to see what goes where.

Briefly, you have two basically distinct electrical systems in the house part (besides the vehicle chassis electrical system): a 12V DC system, and a 120V AC system. The two meet at the converter, a sort of built-in battery charger and 12V power supply for use when on shore power. The 12V system powers the lights, ceiling vent fans, furnace, water heater controls (if it's not a pilot ignition model), fridge controls (if applicable), water pump, etc. The 120 V AC system powers the air conditioner, the AC heating element for the fridge, and the convenience outlets, the microwave if you have one, and maybe a few other odds and ends.

If you're gutting it, probably the best plan is to rip out the old wiring and install new. Some of the components may be worth salvaging and reusing (appliances in particular). The converter, if original, is only worth saving if you need something to keep a door from closing or a boat from drifting away.

Grandson of my neighbor picked up a 1978 Fireball. His is on a Dodge B300 chassis with a 400 stage 1 engine.
His has an odd water heater, refer was from Japan
He is planning on a compact refer
Not sure what he is going to do with water heater. Capped gas line for now.
Same with furnace.
No converter, but has a mounted hardwired battery charger.
Have not checked out stove.
He plans on electric heater or small bottle type heater.