Pulled this code: is there a mechanic in the house?

[Shotgun28]

Well again this isn't for my stang, because she never breaks down..uh hmm. Anyways I pulled a 41 code, and in my Haynes manual it reads:

Problem with the charging system. An open or shorted condition detected in the generator field control circuit. What the heck is that?

Any mechanics in the house? THe main reason I checked the codes was my battery light popped up and stayed on. Any suggestions.
New plugs,cables,ignition control unit in the last 6 months. Belt is fine, any ideas?

Thanks everyone....Trying not to bring it in, but fear I may have too.

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...