I've just taken possession of a new to me Slickcraft (Shhhh - I know this is a sailing forum but I still do have a sailboat). Among other problems the battery charger isn't working. Through serial #'s etc. I've learned it was manufactured in 2011. It is a Pro Spot 12 whatever. I've spent a lot of time on MS's web site re battery chargers and decided for my use the new Promariner Pro whatever 20 would fit my use, which is charging during the week at my dock. Imagine my delight to find it or something close on sale at West for the 4th. They had 1 in stock and I bought it today. When I got it home I realized the 30' of AC supply I expected turned into about 6' of AC - with a plug. I didn't really want the plug because I assumed I would hard wire it into the dedicated circuit on my AC panel. In looking back at the websites for the chargers I noted that the 12 amp replacement has a plug too! Maybe they all do? I remembered that there is a blue plasitic box that I could barely see and could not ID the use for in a photo when I shoved the iPhone up there. Could this be a junction box and the charger is plugged into it on the invisible side? Or what the heck is that? Dam PO.