[VintageLambo] voltage regulators and overcharging

My Espada III has an overcharging situation wherein it"s pulling over 17 volts right after startup. The Bosch regulator number didn"t come up at a local parts house here. Can anyone give me a little advice on this issue?I burned out a CD unit recently, probably because of overcharging.The system isn"t laid out too clearly in my manuals so that a good schematic of that spaghetti on the passenger fender well would be a great thing along with a general discription of how the twin alternator system is set up on these cars. Thanks, Rex