Okay guys so first off my alternator is 1.5 months old i got both it and the battery tested at advanced auto parts and they were good and the belt is nice and tight (lol) , starting 2 nights ago the battery. Light came on, i let the car sit over night and it did not come on the next morning later i drove it for a few minutes and it came on again i reved the engine to about 5k and it turned off for the rest of the day now today it did the same thing after driving for a few the light came on and when i get the engine to about 5k rpm it shuts off and turns on when the rpms drop i drove for about an hour straight with the light off and now i started the car and the light is on again when i rev it turns off and comes back on voltage when the car is off is 12.53 and when the car is running is 12.11 so obv its not getting charged as always reving the engine to about 5k makes the light go on and off any ideas of what to check also the 7.5 fuse for the alt has not blown

 

If the charging light comes on then the alternator is likely bad, especially if it's a parts store alternator. They don't know how to actually rebuild an alternator. The best thing to do is to stick to either Denso alternators or a big name alternator.

 

Denso Alternators can be found on Amazon cheaper than a lot of bad part store alternators.