The alternator grounds through the housing. Not sure what that is but I think it's just the 10mm bolt that holds the positive wirings harness portion to the alternator. Unless that is the positive post that got broken off. Can't tell from the image.

 

I think that's the "B" (as in battery) terminal. It's not ground, it's the output of the alternator. There should also be an insulator on there. Whatever you do, DON"T GROUND IT!!
That looks burnt to me, rather than broken. The connection probably came loose and caused the terminal to burn away. Check the wire that goes on there to see if that's burnt as well.
I'm not sure how to fix it other that taking it apart and trying to replace the stud (it's part of the rectifier assembly). With the insulator in place I don't think there'll be enough threads to screw anything onto it.

Might be easiest to get another alternator.

Good luck!

 

Yes. Thank you for the responses. It does look burned off actually.

Didn't Think it was possible for a m6 stud to burn off like that

probably right also in the the connection came loose. I'll take the alternator off and take a look at it. If it's possible to save it.

So this is the stud. Not sure if I could replace only that. Guessing other stuff melted aswell with that heat. Rectifier assebly is cheap. But my alternator is 23 years old anyways so maybe I should get a new one anyways.

 

Alternators for these cars are cheap now. Roughly $100 from a parts house.

 

Okay. Which brand(s) are recommended?

 

okay so I took apart the alternator and replaced the rectifier assebly with a new one. But now there is a problem... I'm missing the little plastic insulator part. It bounced away under the car along with the broken stud ofcourse.

So where can I get ahold of this part or simular that does the same job? Seems like a simple part. Just special plastic material that can withstand heat so any plastic washer wont work.

In retrospec I should have just bought a used or new alternator... too much hastle for just saving 140$....

But now I did it so I just need this washer now

 

would a nylon washer work?

 

If it's thick enough. You could also try finding nylon nut. Get one with the outside diameter you need and drill out the center to fit over the stud.

 

Thanks

Made a couple of washers from a frying spatula