New alternator, not charging

As suggested, likely burned the VR OR THE wiring.

Disconnect field wires. Measure from big output post to ground. Should be "battery."

With alligator clip wires, or temporary ones with flag terminals crimped, connect to the field terminals. Hook one wire to battery and ground the other repeatedly while watching in subdued light. You should see (and maybe hear) a small spark. In any case, start engine with temp wires connected and see if it charges. If not try again monitoring output stud. If voltage rises way high, there's a problem in the charge path to the battery. If voltages stays "same as battery" the "new" alternator is bad

IF IT DOES charge

Now connect the blue field wire and with the remaining field terminal still grounded, it should now charge as well

If so.......disconnect VR connector and reconnect green field wire at alternator. Devise a way to ground the green terminal in the VR connector. Alternator should charge.

Make certain that WITH KEY ON "in run" that the blue at the VR connector has 12V If so replace VR.