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I have an alternator i would like to fix up how do I do this ? I think there should be a neg and pos conections to "exite" the alternator I have a picture here any suggestions welcome
Yes and no. The voltage out of an alternator is directly proportional to field current and shaft speed minus the diode drop and the current times the armature resistance.Some alternators have built in circuitry that adjusts the field current as the demand on the regulator changes - or as the RPM of the alternator changes. Others do this with circuitry that is separate from the alternator. If you have the type that has a separate regulator then you'd have to provide current for the field. I could be mistaken but if you were to deliver full power to the field and the current demand was not high, the output voltage could rise to a level that is harmful.
I've seen various regulation schemes in amateur radio publications - amateurs quite often employ and alternator and spare gasoline engine for emergency service.