Mystery Solved.
Even after the last tech rep said the inverter was working properly, the fact that I had no inverter output and it didn't pass the shoreline supply as it should have, I was convinced the Inverter was bad.
Amazon Prime shipped one in two days. When I opened the inverter connection box (at the bottom front of the unit) in order to disconnect the old unit... I found burned connectors in the output wires, melted wire nuts etc. Should have examined this before when i removed the AC by unplugging the shoreline cable.
Cleaned up shortened wires and made new connections. Working fine.
Sending new inverter back to Amazon for refund.
Thanks for all the input.