With the terminals connected , and the VR disconnected . With the key " in run " . the green wire is reading only 0.04 on the meter set to 20 . The blue field blade is getting around 10.00 .
You have "the typical problem" of a rebuilt. SOMEBODY left part of the insulator washer hardware out of the green brush holder. You are lucky you did not accidently connect the blue to that you'd have burned up the harness.
Next step is to take the alternator off, remove the brush holders and inspect them. Post photos if you cannot figure it out.
