Yep....I've talked with the reps at Forest River. There is no such thing as a wiring diagram (or any other diagram for that matter) on these things. Every unit is made differently, even units built right beside each other from what I was told. It is very frustrating as you have to create your own diagrams (wiring, plumbing, etc) from what you see on your rig. Not always the easiest thing to do.
On a related not, I agree completely with NWJeeper about doing things yourself. Practically everything I've had done at the dealer I've had to go back later and do again. I've quit taking anything to them. I'd just as soon do it myself so I know it's right.
If you're new to RVing, I've found the RV Repair & Maintenence Manual by Ron Livingston to be very helpful on all the RV systems, though it might not be helpful for your wiring mess.
Nights camped in 2010: 39
Nights camped in 2009: 31
2008 Ram MegaCab Hemi
Reese Dual-Cam WD Hitch
2009 Surveyor 304