Alternator - Delco style 10SI 12 volt, 63 amps
Internal Regulator / External Fan
Self-Exciting voltage regulator - one wire hook up, 14.8 voltage set point
Clocked at 3:00
6 groove pulley 
This is the most versatile alternator ever made for Ag and construction equipment. Self exciting at very low RPM and only one wire to hook up from the alternator to the battery. It comes with the traditional two prong Delco regulator that can be used or ignored.