Paul,
yes I removed the BPC jumper pin cover then assigned acc 1, presuming 2, 3, and 4 were sequentially assigned by the BPC, then replaced the jumper cover.
so this is my understanding of the procedure;
Press acc - the command to start inputting data to the bpc
Press 1 or 2 or 3 or 4 - the block of track I want to control
Press aux1 - opens the numeric keypad
Press 1 or 2 - assigns the block to one of the tpc’s.
Do you do this every time you run your trains?
So, only one relay can be closed at a time?
One other crazy question if I may, are the dat and com wires attached to your tpc’s? The bpc manual doesn’t show them attached but I think they Lionel left them off the picture just for clarity.
thanks again for sticking with me.