It's probably the alternator, but check for loose connections on the back of the alternator. Make sure the ground nut is secure. If it is a chain store sold remanufactured unit, I would suspect even more that it is a bad alternator. I ended up going through a couple of units for a remanufactured POC I got at AutoZone for my Dodge.
There is a very slight chance it could be the engine computer or dirty connections at the computer plug since the voltage regulator is inside the engine computer control computer. I'm betting on a faulty alternator.
There is a very slight chance it could be the engine computer or dirty connections at the computer plug since the voltage regulator is inside the engine computer control computer. I'm betting on a faulty alternator.