Sounds like your sense wire, (#2 on the rear alt case at the regulator plug) , is not connected to full battery voltage or the wire has a bad connection. The #2 sense wire "senses system voltage and tells the alternator to charge hard enough to maintain about 14.5 volts. If a wrong or bad connection to the sense wire is sending the alternator a false low voltage signal, the alternator will increase the charge rate to compensate for this false signal.. Do you have the #2 sense wire connected directly to the big BAT stud on the alternator rear ? That is the best place, then it reads voltage right at the alternator.
A Delco SI series alt will continue charging even if the regulator plug is disconnected, because the regulator continues to recieve voltage from the internal diode trio, so yes, they will charge with the regulator plug disconnected if already excited(charging) when the plug is pulled.
The issue can be confused by the many different aftermarket regulators avalible for that alt.
The original Delco regulators of the 70's would default charge only about 1 volt above normal if the sense wire went open or the regulatpr plug was disconnected. The problem is that some aftermarket regulators react differently to losing the sense connection, some will charge flat out 17+ volts, while others will quit charging if the sense wire is disconnected. My first move would be to connect the #2 wire directly to the BAT stud on the alternator and see if the charging voltage returns to normal.
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