Where does the wire come from(base of mast, through the side of mast or other), and how long are your wires? A simple waterproof two pole connector will do the trick. Attach one connector at the base and the other to the through-the- deck wire for connection to the panel distribution. The through-the- deck should be waterproof . Hope this helps. Enjoy your 19 as much as I have mine for the past 9 years.
Dick