All the bulbs are 12 volt. I'll be d---med if I'll ever take my car back to the shop that ripped me off. I paid my bill, but I was very clear that my big mouth was going to cost them a lot more than $300 worth of business. Didn't seem to bother them any.
I have NO idea if it's a three or one wire. I can tell you it's chrome plated, and has a single stud on the back of it. I'd guess that it would be a single wire, but I know that aftermarket, chrome plated three wire alternators are out there. I have forgotten where I got this, so I can't say what it was represented as.
I'll try to get out tonight and take a look at it. My next day off is Wednesday, so I may see about running that test lead, thanks.
BTW, I did try another alternator, no help.
thanks for the responses.