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Hi, you are correct you will need to replace with an upgraded unit here is a link to the replacment, have you checked to make sure the converter is receiving 120vac? You would test the input then its dc output should be if charging 13.5 +- here is the linkhttp://www.bestconverter.com/AmericanCenturion-CS-6000-Converter_c_157.html
Please get back to me and we can discuss this further, thanks Michael