[rheavn]

"The 1/4" air line off the regulator is indeed the feed line for the air open/close valve for the genset."

This statement has been found not to be true.  I blew some air through the pressure switch air line & it registered on a pressure gauge on the genset in/out valve air line.  In reality it registered on the pressure gauge as it went back to the distribution block and then out through the genset in/out air line.

I've attached a schematic that shows that the lines from the pressure switch & the genset in/out valve are not directly connected, but are both fed through the front "Blue circuit" distribution block.  On my coach this block is located under the left front valance above the front HWH six pack.  Note:  If you do not have a 3 gallon tank in R-1, then the bottom outlet on the distribution block would be plugged.

   

Very difficult to photo the distribution block, but here is one from the left side and one from the right side.