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The third wire is for whats called the sensing or pre-excitation circuit. This wire supplies the initial current from the battery to the alternator's field coil that starts the buildup of the magnetic field that allows the alternator to start producing current.

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โˆ™ 2008-02-20 20:58:00
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Q: What function does the third wire not the battery wire and not the wire with the plastic clip serve on the alternator of an 87 Nissan pickup?
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