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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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