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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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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