You need a new, separate #6AWG (or larger) charge wire to run directly from the alternator to the battery. This wire replaces the not-heavy-enough OEM charge wire, which can simply be folded back onto the harness and taped off. If you try to use it, you will someday blow the fusible link. Some folks have bypassed the fusible link, but it protects the remainder of the vehicle wiring and prevents an electrical fire. Just one electrical fire could ruin your whole day.
The two wires used on the CS130 are the S (sense) and L (lamp) terminals. You'll need a compatible plug to make a clean connection to the CS130. You can buy the adapter pre-made from Paul at "adventure-off-rd" on eBay, or scrounge the parts and make it yourself.
I think it's better to connect the S (sense) terminal directly to the output stud, once you've got the heavy dedicated charge wire going to the battery. The S terminal allows for remote sense, which I'm inclined NOT to use in this configuration (because a flaky sense connection in 20-year-old wiring could result in "boiling" the battery). The L terminal goes to the charge indicator light and provides a tickle of current through the bulb to get the alternator started at low RPM. Once the alternator gets started, it is self-exciting and the lamp goes out.
"Warbird" posted a CS130 wiring option "B" for the PLFS configuration at GM CS130 alternator
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