According to the Wikipedia posted above, unless they used the wrong terms, a parallel circuit is used ;
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A parallel circuit supplies the "charge" warning indicator and is earthed via the regulator.(which is why the indicator is on when the ignition is on but the engine is not running).
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According to that, if a series circuit was used, then the exciter would not be powered with a burned out bulb. A circuit in parallel supllies voltage regardless of the bulb.
From wiki;
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In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function.
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That doesn't mean porsche didn't wire it in series, but why would you when the bulb is powered off the rectifier according to wiki? I believe the wiki is meant to say
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The drawback of this arrangement is that if the warning lamp burns out and the "exciter" wire is disconnected, no current...
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Which would be logical when the (again, wiki)
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The field windings are supplied power from the battery via the ignition switch and regulator. A parallel circuit supplies the "charge" warning indicator and is earthed via the regulator.
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there is no reason the bulb would prevent the alternator energizing, again parallel vs series circuits. The bulb only prevents charging if it is in series with the enegizer. Q.E.D.