Cuda overcharging? Please help...

I can't seem to find a bad ground anywhere. Could it be anything else? I know next to nothing when it comes to electrical. The car has a 440 out of a 77 RV in it, and is running the electric ignition setup from it. Not sure that's relevant or not, but the first two regulators I got were only charging 12 volts at idle as well as with throttle, it wasn't until I got more expensive ones that it started charging okay at idle and overcharging with throttle... I just figured the cheaper regulators were both flukes