My cuz just put an OEM (looks like)reproduction battery in his 71 340 Dart. Now the car is not charging .I didn't want to dig into it without knowing a few things . First thing I thought was the battery was polarized wrong and probably took out the regulator. But checked with meter and it was charged correctly. there is voltage to the terminal on alt.
Maybe there is a brush stuck or something simple as the car is totally restored and is not a daily driver. Any quick checks before he pulls the reg or the alt?