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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
When you are plugged into power the power converter takes the incoming AC voltage and makes the DC voltage, when you unplug the converter switches over to battery power.
Sometimes you will find a breaker near the battery, below is a picture, I am not sure if you checked this area. The breaker would be 18" from the battery and can be on the frame, if you see any at all each post should have the same voltage to chassis ground if one side reads much higher then it is the problem. Most have a tiny tab on them that will pop out when they trip.
Also if you have a manual battery disconnect switch I would make sure you have voltage going in and out of the switch on the large cables, try and follow the path of power.
IF you do not have a breaker in-line and the disconnect is good then I suspect the converter could be at fault.
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Hi was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me..