Regulator needs to be correctly hooked up.
F terminal on regulator goes down to alternator F terminal. Check field wire for possible ground or open/short or poor connection from some previous circumstance.
Terminal 2 of regulator goes to a connector under the dash that goes to the B terminal on key switch. from same connector that will lead up to the fuse that is used for temp, fuel gauge and oil pressure idiot light. check for poor connections or grounds on that wire.
This wire turns on and off the regulator's internal switch that supplies power to alternator F terminal.
Terminal 3 on regulator is connected to wire that runs through the wiring harness and eventually gets to the starter solenoid's 'B' battery terminal. That wire carries the amount of voltage to the regulator and the power to operate the charging system.
Regulator my have a slight hum, but if it is an electronic regulator (non mechanical internals) it should not hum at all. Regulator needs to have good ground, and hood needs good grounding.
To check if alternator is charging good, can disconnect harness at regulator and jump connections 1 and 3 on wiring harness connectors and should have something like 32 output amps.
May have alternator internal troubles... like brushes worn out or ...broken wire inside or short ...
Good Luck.
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