Stock Alternator

[FordPnyLX]

I just finished installing BBk pullys and im having charging problems to the point of jumping it every time, Its not the battery. kragens tested and it is runnuning fine.im wondering what is a stock alternator output, and if so would I be needing a performance alternator or just a new one. While the engine is running the alternator puts our about 12v or so, is that a bad alternator or is it the pullies effect.
--Jeeves Loves You

[Mick]

According to The Official Ford Mustang 5.0 Technical Reference & Perfomance Handbook 1979-1993 (http://www.amazon.com/exec/obidos/ASIN/0837602106/19821993mustangg) available through the Bookstore (http://www.mustanggt.org/bookstor.htm) in the 5.0L and General Mustang Books (http://www.mustanggt.org/bookstor1.htm) section, the output is 60 amps all '79-'87( 70 amps '84-85 w/AOD and CFI and all w/heated backlight) and 75 amps all '88-'93.

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1983 Mustang GT (http://www.mustanggt.org/photo/83tuttle.htm) 306/T-5(project in progress)
1994 Ranger Splash (http://www.geocities.com/mt83rd/index.html?986572015220) 4.0L/A4LD(daily driver)