I learned a harsh lesson when I had to send a part back with the bartender.  I didn’t have stuff able to be disconnected so literally I had to take the entire system apart to send in the relay boards to get it fixed.

Now everything is designed to be a quick disconnect and able to view where it is.

I still do need a label maker (going to get that tonight) to label all wires.  Board 1 runs 12 volt DC and side 2 will run 24 volt DC.