Aggravation! I’ve got a 10-SI alternator installed on my L98 for my 58 vette and up until recently it worked fine. Now my amp meter is showing a discharge with engine running and a very high discharge with headlights on. I’m showing battery voltage at pin 2 of the connector. Pin 1 is not used on this alternator. Cleaned battery terminals - they didn't need it but I'm groping now. Pulled alternator and had it tested at Auto Zone. Checked good. Reinstalled, checked everything I could think of and still a discharge. Pulled it again and brought it to NAPA – same result. Any suggestions? All are welcome.