I have a 96 Ford F-350 7.3 Liter Diesel I put a new altenator in and new

batteries still have batt light? After i put in the alternator the battery light went out for awhile then i started it up again and its back on any suggestions? I took it to napa and had them check it to see if it was charging and they said it was 11.01..... this is my wife's account any suggestions would be great fully appreciated.
i took the alternator out and took it up to napa and it was still good so i have no idea what this could be
as im drving down the road the battery light will go off then back on, could it be a bad ground or something please help im pulling my hair out on this one!!!
and also napa told me that the voltage regulator is part of the actual altenator?
 
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