Thanks. That clarifies it.
Tuff-stuff sells (or used to sell) a black finished revised squareback.
I have one. I was not impressed.
It's my opinion that it draws more field current than some of the regulators can handle.
I suspect this is typical of revised squarebacks but may be amplified by the rotor windings used to create higher output alternators.
If you really want a black finish you can use a regular squareback and strip it down for painting with minimal masking. Be sure that where the bolts and spacers go remain or get sanded to bare metal. While the input current gets its ground connection through the voltage regulator, the ouput current is grounded through the casting.
Take a look at the sticky posts on how to identify Chrysler alternators. That may clarify the two terminals versus one, and from that how a 'one wire' internally regulated alternator was made.
