Hi Al,
I'm sorry that I won't be able to help you with any specifics. My information "runs off the page" with the source of the wires to the ignition relays. The wires (often pink) on the GS side of the coach to automotive interface connectors do not have the automotive numbering designations either.
I'm guessing if you assume there is nothing wrong with the VIM, then you should look for blown fuses in the automotive fuse block. There seems to be multiple ignition circuits (IGN, IGN1, IGN2, etc) at the coach wiring center. But you are indicating no 12VDC out of a single wire from the ignition key switch itself? Everything else works except defroster, mirrors, power seat and spot light?
Since I don't have any information at all, I merely suggest to look for blown fuses at a fuse block somewhere in the engine compartment or under your dashboard.
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