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Easy enough to test if you have a small digital mutlimeter like you can find at most hardware stores. About $20 and easy to use. A good converter should be putting out about 13.7 VDC give or take a tenth and not over .5 VAC ripple which is some of the AC bleeding out into the DC side. Older converters do this as they age. Some converters are builtin and part of the load center like Magnetek and WFCO and some are stand alone units. Batteries that are over 3 years old are suspect and should be load tested to be sure they are good and viable. Clean or replace any cables that have heavy corrosion on them. If you need more input from me here or help with the testing get back to me as all follow ups are included in our fee.
Just checking back in to see if you were able to get this resolved or do you still need some additional input from me here?