Alternator or VR issue?

DH-66cuda said
I have removed the FLD line (Single line Alt) and grounded straight to the car firewall still getting 11.8ish at Alt Stud
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Are you saying you have a pre electronic voltage regulator

Screenshot_20230611-190528.png

and your alternator only has the heavy power feed to the car and the green field wire.

Screenshot_20230611-190735.png

Or

Screenshot_20230611-190759.png