Shaft0201 wrote:
The batteries are charging, but they are just a couple of old crappy car battery’s. I will be upgrading to good dual 6v setup. I was running the furnace nonstop, so I’m sure that was a big draw.
I'm surprised they even lasted as long as they did. Once you have some good deep cycle batteries then you'll be fine. There is no need to separate the battery system, that will just make it more complicated.
Factory converter/chargers are bad, check to see what you have first. There are better ones out there but find out what you have. I had a Progressive Dynamic Inteli-Power unit, great unit.