"how do?" Keep current from

[JWilliams354]

How do I, when I've completed my alternator and everything, keep the current from coming back to the alternator from the battery.  After the alternator has stopped?

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       JWilliams354

[Nando]

The output of the generator needs to have a POWER DIODE to allow flow of current just one way -- from the generator to the battery.

If you have an alternator -- by definition the energy produced is AC, therefore you need diode rectifiers to convert the AC into DC for the battery to "take" the energy as a charge.

If you have the diodes in the alternator that accomplishes what you want - Alternator - battery isolation when the alternator is "dormant"

The diode has to have the capability of carrying the current that the alternator produces and I suggest 3 times the current being generated to reduce the diode power dissipation ( implies that the diode may need a Heat Sink to keep it cool and alive).

Nando