so you are using a voltage regulator. i meant you can't hook up E N F or whatever the alternator poles are to the loom's DF B D, in any order at all. you need the voltage regulator between them. which you have
so yeah, sounds like you might have fried your v-reg. i don't know if others work, but i would assume so. usually alternators are interchangeable as long as the terminals are all the same, so i would assume vregs are the same
that is IF you can find one, later model cars usually had regulators internal to the alternator. perhaps an auto parts shop can sell you an aftermarket one to suit, rather than trying to adapt something second hand from another vehicle?
good luck, let us know now you go