We had a no start situation on the weekend. Seemed like a dead battery, and when I fired up the Genny and patched it through the coach to Chassis circuit (I installed a switch to override the BCC logic circuit) it started right up. Over the remainder of the weekend this was the protocol for starting.
When we arrived home I removed the cover for the chassis battery in the cab, the positive terminal was so corroded, it wouldn't conduct enough current to start the engine.