Good luck with that. My experience with our '02 GT 325, with which we got all the documentation the original owners got when they bought it, suggests that the electrical system is made up as they go by the guys on the shop floor and there is no documentation, even for new builds going through the factory right now.
I had occasion, at the end of the 2011 season, to have to rebuild the overhead cabinets in the dinette slide-out due to water ingress through the slide seal. This included re-doing the wiring for the overhead lights on the underside of the cabinet.
The wiring was the sloppiest electrical work I've seen in decades. White wires were mainly grounds, but some of them were 12V hot. Black wires were all 12V hot, but some grounds were green and others black/white and some hot wires were red. Most of the connections were wire nuts and many of them were loose and showed signs of overheating.
I'm less than impressed.
Frank and Eileen
No longer RVers or FR owners