I haven’t seen a lot of different regulators, but should be 3 leads off of it.
An Armature, Field and Battery.
The Yellow wire from the Generator (the large stud) goes to the Armature on the regulator.
The Blue wire from the Generator (the small stud) goes to the FLD connection on regulator.
The Brown wire from the regulator (Battery) goes to the GEN post on your ammeter (if present), and then on to the BAT connection on your key switch.
The other wire from the Ammeter (if present) goes from BAT post on ammeter, is usually green, and goes to the same large post of the starter solenoid that the incoming POS wire from the battery is connected to.