Why do you need a schematic? Wiring in TTs is pretty straightforward. I would say actual routing of wires in any TT could be different each day or even TT to TT. Electrical in RVs is done to code - NEC article 551. If you want to verify what lights, outlets, etc. are on a circuit, that can be determined by just pulling a fuse or flipping a breaker. Northwood will no different than other TT manufacturers on this so don't get frustrated in them. BTW, I'm an EE and have no desire for a wiring schematic and I've done tons of wiring mods.