Charging issue 68 barracuda

68 Barracuda charging issues. I have replaced alternator and voltage regulator and still having charging issues. Ive disconnected wire from alternator and jumped to + lead on alternator. Get 13-15 volts at battery depending on good connection. Charges good. Ive tried connecting extra ground to VR and body. Only 12.2 volts at battery. If i jump green wire on VR to battery i also get 15v. What am i missing? My lights would pulsate so i replaced VR and was working with 14-16 on gage. It started to drop lower then 12 so i got alternator. New parts same issue.

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