I have a 1999 27' Searay Sundancer equipped with a Marinco 30 Amp, 125 Volt Shore Power system that I have no idea how to use. I bought the boat slightly used in 2002 and have never had a reason to try it out. We're planning a short trip to a marina next week and thought of actually using the boat for what it's designed for (i.e., family travel). No manuals for the system came with the boat and the Marinco site requires a part # which I can't seem to locate on the shore power receptacle. I tried to test it by plugging it in at my local marina, but panel in cabin shows a red light indicating reverse polarity. I was hoping someone here can take a minute to guide this newbie thru the process before I cause any damage to my electrical system. Thanks.