[Chevy 350 Fan]

My ignorance is going to show here so please bear with me: I thought an internally regulated alternator was a one wire alternator I've never heard of 3 wire. Would you mind explaining the difference? I did some research, looked into those links and from what I understand a one wire voltage is sensed at the alternator and 3 wire it is sensed at another location???? (I would assume external v regulator) but that couldn't be the case because then it wouldn't be internally regulated. Maybe posting a wiring diagram would help. I'm sorry my knowledge is a little lacking on this subject haha, I just don't want to fry anything that I worked really hard to buy and install.Thanks for the replies guys!