The JD4010 charge indicator is a light in the dash. No sense losing that indicator as well as it being an excellent way to excite the 10si alternator at lower speed. Find the small wire in your original regulator harness. it should connect with a larger wire that goes from the generator A or ARM stud to the regulators A ARM or GEN terminal. Connect this small wire to the alternators #1 excite terminal.
When you first turn the ign on, the gen light will ground through the alternator #1 terminal and light up. The small current from the gen light will excite the alternator at less than 1500 rpm. Once the alternator starts to charge, the gen light will go out as the #1 alt terminal goes from ground to +12V, so the gen light goes out. Also the gen light works as a current limiter so alternator back feed does not power the ignition system and prevent engine shut down, so no need for a diode or resistor.
Connect the alt #2 sense wire to the alt bat stud along with the heavy Bat wire from the original regulator.
If you already have the 1 wire alternator, just wire it up as instructed using a Delco alternator harness repair plug from your auto parts store for a professional looking and safe wiring job.
A Delco 1 wire will work just fine as a 3 wire alternator and the wiring is all in place for if you ever have to replace the alternator with a standard 3 wire model. Also as you say, reconnect the battery for neg ground.
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