Sounds like the regulator inside the alternator is fried. Take her down to advance or autozone, they will test it for free.
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89'notch
331ci Scat Stroker, Stage II Holley heads, ported Holley Systemax Intake, 70mm Holley TB, 50lb Holley Fuel Injectors, 80mm Pro-m MAF, AFM B-3 cam, Vortech S-trim Supercharger, AFM Powerpipe, EEC-Tuner, TKO, Koni, Eibach, HPM, etc...
Beaten Daily..
http://lowkey.stangnet.com