Well, it may be that I found the problem. I kept watching the voltage drop on the batteries when I was connected to shore power. I'm not the sharpest knife in the drawer when it comes to electrical things, but I tested the converter as best I know how, and I don't think it's putting out any charge. I replaced the WFCO with a PD from Best Converter a few years ago. I have a call into them, but have not heard back. In the mean time (I am in Alaska, and have limited options) I jumped the batteries with the truck for an hour, then hooked up a 2 amp maintainer I have to help overnight. I have read through the battery charger thread going on, but there is too much drama for me to engage there. If Best Converter cannot walk me through a fix, what is the best option I have for a charger at an auto parts store? I don't think I'll have much success finding a good converter in stock in Homer. Suggestions?