charging system

i have a 94 firebird,the alternator start off charging about 14.50 and then while its running it will slowly drop down ...alternator tested out fine and so did the battery...whatelse could be the problem?

i have a 94 firebird,the alternator start off charging about 14.50 and then while its running it will slowly drop down ...alternator tested out fine and so did the battery...whatelse could be the problem?

your regulator for the alternator is going bad. common problem and easy fix, just replace the regualtor and you are fine. most gm cars have them sitting within the alternator. there are rebuild kits or just buy the regulator itself. that will fix your problem.