I finally found some schematics to go by and found my problem was a short. The wiring diagram was close but not exact because of the options I had on board my specific boat. I tried to narrow the short down but couldn't due to not being able to access the whole run. It had to be a wire to wire short because of the boat being fiberglass and no chassis ground. I ended up pulling a new run and and took the Nav/Light switch out and cleaned up the terminal connections and installed a inline fuse to match the amps being drawn. All is good in the neighborhood now and the cooler is being filled with nice Bull Reds here on the Gulf Coast. If you have good knowledge of Marine electrical systems and how they work using positive polarity instead of negative then everything will become more clear. The best bet is to get the right gauge of wire and and make things simple by hooking the radio up not using previous installed wiring. Once you have it working then fish the new wire through the hull where needed and check the amps being drawn then install a inline fuse to match and your local marine store or Carol at candoparts@yahoo.com can hook you up with any Carling Switches you may need to match your switch panel on board. Hope this helps... JJ