weird idling problem
The alternator, if still not working..... Sounds dead. Spinning an alternator at a track up past 6k burns the brushes. If it isn't dead there is one fuse under the dash and one under the hood. Plus plugs. OR maybe your gauge died. Unlikely but possible. If you have a multimeter, do a voltage check, and also resistance across the alt positive out and the body of the alternator.
I have a slight suspicion that when you fix the alternator, your idle might start to feel less like a 92 Geo Metro with a vaccuum leak.. Good luck.

