What is the problem?
If it's a difficulty with the chassis wiring (as opposed to the coach's wiring added by Coachmen), you should be able to obtain information for the chassis from Ford (or Chevy or Mercedes-Benz or whatever company is appropriate). Similarly, wiring diagrams for individual appliances are often available from the manufacturers or by searching online. If it's a problem with the house wiring itself, though, it often is hard or impossible to get an official diagram; you're usually better off just tracing things down yourself. The systems are not exceptionally complicated in general, though tracking where wires actually go when they disappear in a wall or a bundle can be a definite challenge.
