Replaced the fuse. Batteries charged but only held charge a few hours. Broke down and bought new batteries. Bought Optima 27 AGM Blue top. Did some research and found these were highly rated for RV use. Also good for cold weather. I think my battery problems started last December when I was in NH and it was below zero for most of my stay. The Optimas were expensive but Pep Boys had a 25% off special if ordered online. I just picked them up today and installed them. I'm hoping my electrical problems are resolved now. Time will tell.
First RV was a 1968 Nimrod popup
Second RV is a 2012 Sunseeker 2300
nights camped 2011: 42
nights camped 2012: 48
nights camped 2013: 40