No wiring at all? What did you do with it?
Might be a bit out of my league.
If your Alt has the big round socket I have one for you.
I got in a few hours today, stripped back the RN85 engine bay loom alt wiring, as its on the opposite side of the 1UZ Alt, and to deleted the external regulator.
There was a great deal of cursing today!
Tell you something, Stock ECU is so much more work than stand alone.