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I am sorry for the long wait
can you tell me the make and model of this vehicle ?
did this problem start out of the blue one day ?
when will the check battery light come on and off ? at idle ? or driving at speed ?
has anything been done yet to correct this problem yet ?
with these alternators on these trucks being a self charging type alternator which internally it will up or down the charging depending on system voltage and will turn on the battery light when it is not charging correctly or has an internal failure or issue there usually is an alternator failure itself internally
make sure both battery cables are clean and tight if they are then make sure the neg ground cable is clean and tight on the engine and the 2 grounds on the rear of the engine are clean and tight
the odds are all of that will check out and if it does make sure the connections at the alternator are clean and tight if so then replace the alternator
that should correct this issue you are having
how are you making out ?