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More than likely the alternator is going. More than likely the brushes are worn to the point that the wire connecting them is holding them off the armature. When the engine rev's the alternator makes more power and that is enough to turn off the light. You can get a new unit or if you can find brushes they can be changed if you have a little electrical experience.
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Ken
2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....  
Powerstroke Acronyms
TSB Information
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