Manual and diagrams
The link from Scubagirl will get you a fuzzy view of the manual, but I have not found the manual itself very useful. My 25.5 was modified quite a bit and I have had to trace the wiring, etc. when doing repairs. The bilge had no pump when I bought the boat and all electronics were installed by the prvious owner or me, not by Hunter. The wiring diagram in the manual is very basic. Cabin lights have wiring above the head liner and are not hard to trace. I have not tried to trace the bow running light wiring, but suspect it would be somewhat difficult to trace and locate if replacement was needed.
Sopme basic boat information will be found under the boat info tab at this site. There is a lot of information in the archives that you should find useful. You should also find some good tips on useful modifications. The 25.5 is a fun boat and rather easy to deal with. The old Maxwell winches (original equipment) are no longer made and need serviced annually to keep them going. The only source I know of for winch parts is in Australia, but parts are still available for a price.