If your Porsche 912 starter has failed, we reccomend replacing the starter with a high quality starter. DriveWire sells OE quality Porsche 912 starters at low prices.
The internal type of a Porsche 912 alternator regulator is located within the alternator and in some cases is replaceable. To replace the Porsche 912 regulator you must remove the power form the battery. The preferred way is to just remove the ground or negative battery cable prior to servicing the Porsche 912 alternator or regulator. If the regulator is internal and is not removable, then the entire Porsche 912 alternator assembly will need to be replaced.