The big black one goes to the starter (hooks up to the green wire).. the purple (I think) is the exciter wire and that goes to the ault gauge in the instrument cluster.
I think there are 3. Which one are you talking about?
On a GM 1-wire setup (if that's what you are converting to), it goes to the battery + terminal. You can tie into this at the big cable at the starter I believe.
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