Three wire alternator on a two wire system?

I came home and tried to figure out if my current voltage regulator is a solid state or the original mechanical, but its a sealed unit. It doesn't appear to be very old, but is there any way of telling by just looking at the outside? I know these might seem like elementary level questions, but I've never dealt with it before so, consider me on an elementary level.





As far as calling it cuda, I realize that the formal name is Barracuda, but I also realize that people most likely called it cuda long before it was ever officially 'cuda. I use it for the same reason I don't say Plymouth every time; its shorter and everyone knows what it is. Is that lazy? Yes, yes it is. No one ever complains when someone calls a Corvette a Vette and yes I know its not the same because there was never a later model called Vette, but honestly does it really matter?

Anyways, thanks for the help guys! Its truly appreciated.