Alternator field wires

OK, do a "few things." Ground one field terminal with a clip wire, then connect the blue. This should cause the alternator to charge full output. Make certain with the key on, that you are getting battery to the blue wire, and that the field is actually drawing current. One easy way is to turn key to run, and in subdued light, connect/ disconnect the blue field. You should see a small spark when doing so. Alternatively you can measure current with a meter. The field should draw +/- 4A or so

If that is ok and it does not charge, measure at the alternator output stud while running fast idle. If that terminal is way high, and the battery is low, then you have an open in the charge wire/ path to the battery