charging system questions

[project 67 sub]

i know this is the wrong forum but the electrical forum doesnt get very many people looking at it, and i dont think i seen the answer to the ? that i have. i have a 67 burb that the po changed over to an internal reg. alternator and an h.e.i. distributor. the first ? that i have is the problem that i am having is, is that it shows that the alternator is not charging. up untill about a week and a half ago it would charge fine, now it is not charging at all. the battery seems to be good, the alternator is good and showed that it was charging at autozone when i personally took the alternator in and tested it, but i still changed it to a better one. the other ? that i have is that when i upgraded the alt. i got a 105amp alt. and it has 3 wires that come out were their was originally 2 wires coming out and i dont know exactly what wires go where. their is a red wire(about 10gauge), and a brown and a black wire(about 14gauge) plus the batt. wire on the back of the alt. thanks in adv. this place unlike the other forum that i frequently go on, (for my jetta) --->www.vwvortex.com.<---- they suck and are all sh!+ talkers that are better than every body else. and are haters but anyways like i said thanks.