(quoted from post at 08:31:29 07/11/17) 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. {{"...and draws nothing from the system when idle." This is NOT the case with either 3 wire or one wire Delco 10-SI, as the voltage sensing circuit inside the internal VR ALWAYS draws current, although very small.}} 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. {{To "prevent drain" is NOT the purpose of these wiring arrangements on the excite wire, but rather to prevent the alternator from feeding voltage/current to the coil after ign is turned off, which can keep engine running even with ign off.}} 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. {{just to set record straight for future readers of archives}}
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