Vz thunder alternator not charging battery

[Nath89]

My new alt not charging my battery it's reading around 12.4v when I charge battery and put it in and start the car but I will only get about an hour worth of driving stopping and starting the car and I've turned off lights,stereo,a/c please help?

 

[Stumpy_gumpy]

what was the result of this as im having the same issue