Confirm ground from trans to chassis,
Connect a test light to 12 (B+) terminal on the alternator and the other end to ground the light should come on.
Now connect the test light to the (61) terminal on the alternator and the other end to the B+ terminal, the light should come on.... start and rev the engine above 1200 rpm's the light should go off
With the engine running and above 1200 rpm's check the voltage , it should read about 13.8 volts. ...........let us know what happens .