[RayChez1]

OK, now we are getting some interesting information when you mentioned one battery fully charged and the other almost completely dead. The two batteries should be hooked up parallel and you mentioned that they are. So if there are no loose connections on your parallel wiring, then what is causing your problem is that one battery that has shorted out and is bad. Needs to be replaced. But to make sure I would take that dead battery out and by itself hook up another battery charger and see what happens. If it charges right up, then it is a loose connection somewhere. If it does not and the charger shows a fault, then the battery is bad. Your two batteries hooked up parallel should give you 200 AH. What you are getting now is only half or 100 AH.