You still haven't mentioned what alternator you actually have. The older 10 ,12, and 17SI series only has three connections. The main output post, and #1 and #2 on top. The CS series has five connectors, the main output post and a harness connector with four pins and they come two ways - P, L, I, and S, or . . . P, L, F, S.
L=Lamp P=Stator and can also be used as a tach drive F=Field/Connected internally to Field positive AND may be used as a Fault Indicator.. S=Sensing wire to Battery or system. I=Regulator.
The S terminal is the large terminal and is for remote voltage sensing. The L terminal is in the middle of the 3 smaller terminals. It is connected back to the idiot light and then back to the ignition. If you run a switched ignition source wire to the middle terminal, you will turn on the regulator when you start the car. The lead will need to run through an idiot light or you will need to add a 47 ohm resistor, as the regulator can not handle a full 12 volts through that terminal
If you do not wish to run an idiot light and you don't want to install the resistor, you can run a 12 V source to the F pin rather than the L pin.
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