Ron Francis / Denso alternator hookup

The charging wire to the battery/starter relay goes to the large post on the alternator. The other three terminals are as labeled in the diagram below:

View attachment 1715735476

Thank you for the diagram. Sadly, I don't understand the terminology. "12v reference" means what / where? Does "12v ignition switched source" mean 12v supplied to the fuse box or 12v supplied from elsewhere?