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a smaller alternator is not neccessarily more efficient, it will run at higher speeds, I want to be able to control WHEN it charges, even it you cut the main current carrying wire it still gerenated current to supply the feild to keep the output at 14V, and if it does that is has losses associated with the rotating magnetic feild as the iron in the stator is being alternatly magnetised in opporsite directions, it's also dangerous for the alternator. A clutch, or my way as I mentioned above somewhere will stop the feild being energised. there are alternators with a built in clutch, a GM car, called different names in different countries. Opel/Holden Vectra etc. A clutch is the best as the fan is stopped as well, but alternators with a clutch are not so easy to find. my plan is to do it like Piwoslaw suggested, only run it when braking, or better when the injectors are cut off?
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