Battery voltage question

So little update..
Looks like I do have a possible problem ..
I took the cuda (68 383) for another ride tonight,, ran great..
So when I got home I put the volt meter on the battery and car running with no accessories on the voltage at battery got as high as 15.50 and on alternator stud I took a reading of 15.90.
I took the VR off and cleaned it and it made no difference. Also I am still running the ammeter and it's not gone anything over 3/4 on the gauge any ideas?
Thanks