Nu-Rex 12V alternator Overcharging

[wrmyers35]

I have a brand new Nu-Rex 12 volt alternator, still in the original box that I've kept in the box for a couple years, as a spare.
I recently installed it on my 1931 SW Fordor and it will not self regulate, it constantly charges at 15 amps, and when I turn on my AC it pegs the ammeter way past the 20 amp mark!
No matter how long I run the engine it doesn't charge any less.
I have a new 12 V battery with new cables so that's not the problem.
I thought it may be the internal voltage regulator so I bought a new one from NAPA that fits late 80's GM vehicles. The one they sold me looked exactly like my original, but they weren't sure if was the same function.
Once I installed the new voltage regulator the alternator would not charge at all!
I reinstalled the original regulator and it acts just the same, it overcharges.
Does the Nu-Rex alternator use a special regulator? (It has red letters 12 SE printed on it)
Anyone got a solution for this issue?
Bill