:welcome: aboard Geno1267. Great to have you join us here on iboats...
Usually you can tell if a voltage regulator is working at the battery. Take a voltage reading at the cranking battery and see what it is before cranking the engine. Then after the engine firers up, take another reading. The voltage should be a bit higher with the engine running. Then riv up the RPMs and see if the voltage goes up and stops around 14 to 14.5 volts or there about. It if does, everything is fine. But if the voltage keeps rising as the engine speeds up, your regulator is bad...