110 issues with inverter lines

[Doug& Kim]

Have two cables from my old Eaton invertor one is labeled 110 in the other has no markings I have 110v power on both cables the power in-side shows proper voltage across common to neutral and common to ground. the other line gives me110 across ground wire to neutral and no voltage between common to neutral. I have lost power to the front of the rig. I am perplexed. I have a 2002 Gulfstream Sun Voyager. Eaton has been no help with their schematics I have several schematics from Gulfstream about my coach nothing about this system. I assumed the voltage out line was what i needed for my new invertor but blew it up today when generator started. My house batteries are Lithium with a dc-to-dc charger handling the charging from chassis battery the convertor has been replaced to handle Lithium battery, and the chassis battery has been isolated from that system. Attached is my 12volt system.