I have a 90 CO. I rewired it this winter, the old wiring had a lot of corrosion. This is what I did:
Electrics
1. Move electrical base from the upper shell to the lower shell, greatly simplifying the wiring layout with all high-amperage items except the vent fan kept in the lower shell near the big battery.
2. Standardize 12V wire colors: red is hot, white is neutral, brown is running lights.
3. I don’t need a power center. Most of the time I have no shore power and everything onboard runs from the battery. If I have shore power, it’s only needed to run a battery charger, and then I still run everything from the battery. So my shore power connection only needs to run to a switch, then an outlet, into which I plug a battery charger that’s hard-wired to the battery. I don't even need the converter that I already have.
4. Remove shore power connection from upper shell. Replace the (broken) vintage outlet with a new unit on the aft end of the lower shell.
5. Remove external lower/upper shell wiring connection.
6. Lower shell gets a shore power connection in the back wall of the camper, which feeds to an outlet in the battery compartment. This is the only 110V outlet in the camper.
7. The following things are wired to the battery terminals:
a. AC-DC charger (about 10 AWG)
b. Solar connectors (standard AWG)
c. DC-DC charger (8 AWG)
d. A 6-fuse block (8 AWG)
8. Fuse circuits go to:
a. Refrigerator (14 AWG)
b. A 12V cigarette lighter plus USB-A and C outlet (14 AWG)
c. Hydraulic pump, with a switch permanently installed near the pump motor (behind the cabinet door, so not normally visible).
d. Water pump.
e. Top shell lights and vent fan (14 AWG)
f.