Isuzu Pickup Alt. problems

I'm having issues with my Alternator on my pickup, now when i go out to start the unit, i'm getting lights on all my notification lights under my
rpm gauge and speed gauge, also the fan is disabled but only until i give the truck a really good rev. Then the lights go away and the air blows just fine, i've been told that this is an issue with the Alternator and an easy fix with-in the Alternator, has anyone else heard of this issue, if so i'd really appreciate some feedback to save me having to go out and buy an Alternator.
Thanks folks!
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