Owner's manuals are usually of little help for real details. I'd suggest you do a top to bottom search in every cabinet, closet, and compartment of your RV, noting any system you find. Write down make and model #, any fuses or breakers, and then spend time searching for manuals for each item you found installed in your RV. You can also do a search of the forum by using the search box at the top right of the page with the Google logo.
Here's one thread with infor about your Dophin: http://www.irv2.com/forums/f105/nati...ers-55152.html