Disregard all this if that is not a CS series Delco, but looks like a CS-130 to me.
Unlike the older Delco SI series, the CS might need a special resistor wired into it to make it work if you don't have a system with a factory idiot-light. Special pigtail connectors are available with the resistor built in. Might be some other work arounds but I forget. I have only used a few CS series for swaps into older stuff.
The CS130 alternators use a four-connection plug; however, for the purposes of a changeover into a vintage car, you will only be using two of the four connections. The connector will be marked PLFS or PLIS.
Depending on the system, you will only be using the S and L or the S and I terminals. P is the phase connection for externally powered accessories, such as a tachometer or hour meter, and can be used as an option. L is the alternator indicator lamp circuit and in some systems will be the ignition connection. F is an external field monitor connection. S is the main power distribution connector. The I connection (when present) is for ignition and connects to the ignition switch (keyed on/off switch).
If you have the PLFS connector, it may be necessary to adapt the L connection. On a charging system with an ALT bulb, you can connect the ignition switch wire directly to the L terminal. If the system does not have an ALT bulb, it is necessary to install a 50 ohm diode in the wire leading to the L terminal. You can purchase a diode and solder it inline or you can purchase a jumper harness with the diode already in it (Delco 8078 or GM # 12102921). This harness has the 10SI connection on one end and the CS130 connection on the other.
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