sounds like your 12v cut off switch is in the 'STORE' position, which is why you don't have lights.
also, you may have an 'Aux' or 'Battery boost' switch on your dash, to tie the two battery banks together, to allow you to start the generator - hold it down while priming/starting the generator, and even for several seconds afterwards...
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada.... formerly Georgia, then NorthCarolina, now Alabama : )