Have you tried it at the genset? On my old Itasca you could also start it at the genset. It also had some re-settable breaker switches in the battery compartment, one of mine had tripped. It just sounds to me that your coach battery isnt cutting it. Are all the connections clean? What does your manual say the blink code is?
PS sorry the thread title went in one ear and out the other :-)
Jim & Debbie England
Do you have Gas? 2015 F350 6.2L CCLB DRW 4.30 axle. 2012 Yellowstone Ridgeline 34RLT Fifth Wheel