squareback alternator wiring in pre 70 car issue

Using the meter to measure voltage at the blue (IGN) terminal with engine running is helpful. If the voltage reads about 13.8 to 14.2V, the alternator and regulator are working fine. The high battery voltage happens when there is voltage drop between battery and blue (IGN) circuit, typically occurs at bukhead connectors. Fix drops, battery voltage will be normal.