Always start at the source. If 110v, does the shore power outlet have power. If 12v, does the battery have power. Work forward from there. Working backwards from there problem will always take more time and create all kinds of WAGs. The converter could be a problem but, in most cases, the 110v power just passes through the converter to the main fuse box, so the converter has no effect on shore power with the exception of a possible circuit breaker at the converter. With that being said, if the batteries are not being charged the issue lies with the incoming power from the "Source" to the converter. Does the unit have an onboard generator? Most units with a generator have a transfer switch that switches source power from shore to generator. If the generator powers 110v circuits then the problem is with the source at the pedestal, the incoming cord or the transfer switch.