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Hi my name is Robert...
SO if I understand correctly when you are plugged into shore power the batteries are not charging and you have replaced them???
Normally if you had an issue with the Automatic Transfer Switch you would not get any AC power into the RV unless you had the inverter ON. IF you have power going into the ATS but nothing coming out then it is the issue, if you have power going in and out of the ATS then the inverter may not be charging the batteries, when you plug into power you should see close to 14 volts at the batteries and it should not be going under 12.5 volts. IF the inverter is not charging go to the inverter and follow the cables, look for a LARGE fuse that is bolted to the frame, make sure it is not blown, if that fuse is blown then the batteries are not going to get a charge via the inverter, if the voltage is the same across the fuse then internal issue with the inverter. Shut the inverter down and restart it if you have not tried so.
Also try running the generator if everything works and the battery is charging then it is not an inverter problem but points towards the ATS... IF you are using any cords or adapters on the main cord get rid of them, plug in direct and see what happens......
Hope this makes sense, please feel free to follow up is needed... Robert
Let me know if you need more help on this, have to run out on a service call soon, will respond if needed when I get back. Please keep in mind I only get credit for helping when you select a rating at the top of the page... Robert
Hi was Just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me...