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the black yellow wire is the one we are talking about.
do NOT just ground it, ever.
if you unhook it, then start the car, the alternator will not charge.
If you then hook it up, the alternator will start charging.
If you then unhook it, with the car still running, the alternator will still charge.
You need to "ground it gently through a lightbulb" to kill the field so it quits charging.
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