You know where I stand,, so I'm done.. I did learn about what a" Duvac " alternator is in the last couple days,, when mine took a hike coming home from the last trip out. I have a Leece Neville Duvac system and had to learn about it to order the new one for a replacement.. I did not realize in all the years I've been twisting wrenches that an alternator could charge two battery banks at the same time while keeping them segregated.. The two banks can even be different voltages as in 12 and 24 which of course must be kept separate.. This system is found mostly on buss-es and motorhomes that use two banks..>>>Dan