Question about 2000 Pontiac Grand Prix

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Alt has a small red wire in the plug. what is it for

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The circuit it forms part of runs from the battery, throug hthe charge warning light on the dash, the the voltage regulator on the alternator. The wire does two jobs.

When the alternator is generating output, it fails to carry any current (sounds odd, but that's how it is) because there's a similar voltage at each end. As a result, the charge warning light on the dash goes out.

When the alternator is freshly spun up, current flows through this wire (sourced through the warning lamp) to provide the initial excitation for the alternator, allowing it to generate electricity. One the alternator is working, it uses its own power to create excitation.

A.

Posted on Apr 30, 2010

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Is it possible you have a blown fusible link? Wiring diagram should show where these are located. You say the small red wire is zero volts with key on. Is this the wire that supplies "exciter" volts to alt? If so, it should be 12 volts at key on I think.

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I hope this help on your question.
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