I don't have my laptop with the service manual on it with me.
I always thought that with the ignition key turned forward to the first detent, did not power anything, but just allowed you to shift from park.
I've had a parasite draw for awhile now and it has zonked one battery and one maintainer.
it appears to be coming from the CLK-CIG circuit, but I have the radio memory circuit and cig lighter plug unhooked.
I am suspect I may have tapped power for my oil pressure gauge from that circuit awhile back, so I will tackle that next.