I know there are many variations of inverters out there but in my case my converter ( I like to call it the on board battery charger ) is built in the Inverter, to check my 12 volt side of my inverter to verify if the converter is charging I remove the positive and negative battery cables from the inverter and either plug in the shore power or fire up the generator and put a multi meter on the positive and negative post of the Inverter, if you have no reading then the converter part of the inverter is not working, the inverter must be on to check this and make sure you wrap the positive battery cable end with lots of tape as soon as you remove it from the inverter and keep it protected, this is a simple test and can eliminate a lot of searching for something else that might not be a issue.
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