I was just like you a few months back.

I did the following and haven't had a problem since.

1) Replace positive wire from alternator to battery.
2) Replace the ground wire from alternator to frame.
3) Replace the alternator wire in the wiring harness (red one).

And the most ghetto fix....smacking the dashboard.

Sometimes the ALT light doesnt light up when I turn the key to II.
A hard smack on the dash and it lights right up. A wire is probably lose, but i dont have the time nor the energy to hunt that wire down behind the gauge cluster.

Good luck with your car.