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Two things come to mind here.............the first is that there is a shortstop breaker in that line feeding the fuse panel. It must be an auto reset version since it reset by itself. I am adding a link so you can see what they look like. It could be almost anywhere. The second thing is that there is something that is causing a direct short and drain on the batteries and opening up the breaker. Usually, you would hear a clicking sound as the breaker opens and closes. It may be a solenoid instead and the contacts are burned. Another thing to check would be the converter itself, especially if this has an older Magnetek unit that is the OEM box and hasn't been upgraded. Those had two charge feeds to the fuse panel. One is red and one is blue. I have seen just one side go out. The red side feeds the battery charging and several other circuits and the blue side is lower voltage...........usually about 12.5 VDC or so and feeds all the rest of the circuits. So where exactly did you hook up that jumper? And is your load center made by Magnetek? IF so, take a DC volts reading at both sides and see what you read. And interesting that despite you having the 13.6 VDC at the batteries, they were still drained later. Only a short or a converter not working all the time would do that. Those are my thoughts on this so far. Please get back to me and let me know what you find and we can go from there. All follow ups are included in our fee.
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So what switch controlled that solenoid? Are you talking about the battery disconnect solenoid? That is the only one between the batteries and the panel that I know of.
O.K..............some models did have another solenoid in there. Not very common! Glad you got it worked out!
you are welcome.............be safe!