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Unplug the plug on the top back of the alternator and see if the light goes off.If the light goes out,more than likely its your internal voltage regulator..Local Alternator and Starter shop told me thats how they check them.
Also,from personal experience,check all your battery terminals to make sure they are good and tight..I thought mine were tight and had an issue there aswell.Hope this helps.
2001 F250.Custom Tuned,Ball-Buster Turbo,5"Exhaust
ITP Reg.Return,TD Billet Converter,Built Tranny,Snow Meth/Water Stage 2..plus a few more things!!She will Hunt