Ropeguru: That is perfect and just as I thought. I was looking at a very similar diagram of the handler, not the heater. Thank you!
tberg: There does not appear to have a terminal strip like my garage heater with the simple markings:)
robbin: Thank you very much for clarifying that AC unit, that just saved me a long, dirty trip across the attic:) Now all I need to do is connect into the gray wire and I am set.
Thank you all very much.