Vernon - Thank you! Yes, with the AUX1 - 2 was used with each re-programming for the R4LC.
Gun Runner John - thank you. I expected as much. I bought five for the AC regulators. Three have tested bad so far. I will attempt to use the last two.
I read your comments about the TMCC R2LC rewiring under "Lionel 6-11114 Odyssey Mohawk Smoke Unit" and was hoping the same would work for the R4LC.
I got a "D" in both semesters of electronics in college. I will dig into your Smoke Control Relay for Special Occasions. We will see how it goes.
Of course, I am way out of the warrantee period from Lionel for the AC Regulators.
Thank you very much for your prompt replies!
Hank