Battery Light on?!, Please help Options

[99GT]

Alternator went out, burnt some wires. Got fresh wires soldered in to replace the burnt ones.
Now the car is in good and running order, nothing inside seems sluggish. I had everything I could on while driving 10 mile trip to and from.
E lights, rear defrost, wipers, radio full blast, heat full blast. The car made it without no issues.

No corrosion at battery.
Charged the battery before putting in, but battery was good previously.
I also tried a different good working battery. (light still on)
Battery cable ends are tight.
All the negative cable, and grounds are tight on both ends.
Alternator belt is secure and tight, but not too tight.
All the connections on the alternator are secure.
Brand new alternator.

Please help. I'm stumped.

This post has been edited by 99GT: Jan 3, 2009 - 10:35 PM

[99GT]

I went and got everything retested.

With the new batt, my sis bought me.

14.25 at idle.

The oreilly guy said that when we redid the harness, we should of used the same gauge wire. I used some bigger gauge wire when we did it.

Do you guys think that might be my problem?

But anyways my new used complete harness came in.