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hi,
I converted my 85 f250 4.9 to ds 2 awhile back.
but ive been seeing this ....
"Optionally, but a good idea, the white wire in the 2-pin connector is connected to the "S" terminal on the starter relay. This is used as a cranking indicator to the module, to retard the timing slightly to ease the load on the starter motor"
It should be wired in the harness.
Do you have.trouble with the starter laboring on hot starts?
You could always check with a test light while cranking.