That is just one, of many. All fuses, circuits, breakers etc are also shown in other diagrams. As for showing actual wiring routes through the rig, I suppose with a 15 ft travel trailer it might be possible and maybe even done, but with a 40 ft motorhome with multiple single and combined wiring bundles, and multiple systems, it would require way too many' diagrams. Mine does show the complete circuits, and often where the components are, but not the paths they take. Of course on the 110 diagram, it will show how the power comes in from the gen. or shore power or inverter etc and how it is switched, and then to the panels and breakers but not the receptacle they feed. I guess they figure that if it says "bathroom" on the breaker box, you will know where the other end of that circuit is. On the dc side, everything, [at least on my coaches] in the complete circuit is shown, just not the physical wiring location in between components. I am certainly not an electrician and will often spend way too much time finding an electrical problem, but having these schematics allow me to muddle through it.