You've got me confused with your comment . . ."If you don't run the one wire alternator "hot" wire through the switch, then you'll need a diode to keep the alt from draining the battery. "
All a "one-wire" alterntor is -is a stock alternator with a self-exciting regulator swapped in. This "one wire" setup uses no outside field current and draws nothing from the system when idle. I.e. no diode or resistor needed. It relies on residual magnetism inside the alternator to get itself started.
A standard SI series Delco with the OEM three wire hookup uses a field-current lead from the ignition to get it started. This does require some sort of isolation to prevent drain. It can be done with a relay, a diode, a resistor, or even just some trick wiring. If an ignition switch is used that has both an IGN and a ACC terminal - using ACC to power the field is all that is needed to prevent drain.
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