Barry,
For each of the three channels working properly, I have connected the Legacy base to a bus bar and from the bus bar I have run a wire to each TIU Input. That works for the other three channels and I did the same for Variable2.
I will revisit the wiring to be certain there is proper contact.
Embarrassing to say, I do not know if the Legacy loco is coming up in conventional. It does not move nor have any function beside a light in the cab.
Thanks again
Eliot