BarabooBob wrote:
I believe that the photo show a WFCO converter. Those are well known for failing in many ways. Some of them boil the batteries dry by not regulating the power properly and they also frequently will not go into the bulk charging mode to speed up a very low battery.
I would replace it with a higher quality converter such as Progressive Industries.
Funny you should say that because that’s what happened in my last battery. I found it boiling and making my interior smell like rotten eggs all night