This is a good one. I have a 2001 Ford Taurus Lx 3.0. I had a loose terminal so fixed that the negative side, ok and then?

Found the wire was also loose where the wire nit screws down on altanator. The stand off broke off even. How do you fix that easy out?

If you meant the "stud" instead of stand, you have to replace the stud. Or you can get an alternator from a junkyard.

I meant stud not stand off

Drill through the stud then get a easy out to get the stud out. Do this carefully if you break the easy out in there you'll then need to replace the alternator

If you broke the electrical stud on the alternator you will have to disassemble the alternator to replace it. It would seem obvious that you won't know how to do this so probably best just to have a shop replace the alternator.

Usually the alternator stud has an addition nut on it which you can snug up to make it tight. If not, if it works that way, you could glue if with epoxy but the best thing is replace with new rebuilt or used. But don't expect long term service from used. If you like to hold on to cars, get at least rebuilt.

Remove it from the inside.