Yellow wire is circuit 2. It is lighting, including ceiling lights and storage compartment lights. Make sure the lights are off in all storage compartments. Schematic diagrams are available in your manual. IF you don't have one, ti is available for download at the Airstream web site.
Can't help you with the orange, but it looks like an orange 120V extension cord that was added for some purpose. From my experience it is not factory.
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins