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07-05-2008, 06:42 PM
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#1
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Registered Member
Join Date: Feb 2008
Posts: 1,652
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That's only true of older cars. Since the 80s the ECU has been modulating the field current of alternators according to load. Since it's the work done by a magnetic field shoving electrons around in the armature of the alternator that causes the greater proportion of the drag on the motor, turning the magnetic field off, let's say be de-energising the field coils, will also turn the drag off, apart from the frictional drag due to the bearings and belts. As you might guess, this doesn't shove any electrons around and no current is produced at this point. When the ECU sees increased electrical demand, it turns the field coils back on again.
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