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I think the 12v is causing an inbalance in between one bank to the other but there are others who are much better versed than my limited skill set...who can hopefully give you answers. I would try removing the 12v lead, charge and test all 4 batteries and see where you are?

Where they are OE the 12v usually comes off the dual voltage alternator 12v stud. I don't think it meant to be tapped off the batteries unless a converter/inverter is used. I think your problem is the 12v hook up. Also, the OE solar panel is one large one not 2 small ones. That could also be...