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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
Get a volt meter and go to the batteries and take a reading, plugged in you should see around 13.5 volts, if the voltage is under 12 volts or lower the inverter may not be charging, on the cable from the inverter to the battery should be a LARGE fuse mounted to the frame of the RV, I would check voltage on each side of that fuse to make sure it is not blown. Click HERE for a manual and you can see what the fuse looks like and the wiring. This is a old converter and not to reliable when they get a few years old, my experience is they have a high failure rate after several years, the inverter is obsolete so if you have the wiring correct, no fuses are blown it would be time for an upgrade, not to many places at all will dig into the inverter and repair it...
IF you have more questions or concerns please feel free to contact me.... Robert