Guys,
The 2012 has a 30A AC input and 2 20A outputs and each has a CB per the above photo. The default will passthrough 120V from it's 30A AC input (ie It has a automatic transfer capability). If there is no AC input and the inverter is turned on then the outputs are powered by the inverter from the battery. Otherwise the AC is passed through and used to charge the batteries.
A very common setup is that many plugs in the rig are connected to the 2012 output.
OP Remove the 2012 AC Access cover. Do you 120V on the input wire when connected to shore or gen? How about the 2 120V outputs. If you have input AC and no output the next step is to check power on the 3 CBs. Does the charger work because if so then the unit has input AC power and it's not the input CB.
There is no fuse for the DC lines. You'll probably find a large one like 200A near the battery. Besides yours is OK because the inverter is OK.
