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Are you talking about using the alternator as a motor to keep the engine spinning while at a stop light so you don't have to use gas at that stop light? if that is the case then don't bother, the energy it takes to keep the engine turning has to come from some where and charging the battery back up once you start moving again is going to put a decent load on the engine, off the top of my head I don't remember how much power the starter draws but it would be about the same for any motor to turn the engine over for a full minute, 100 amps or so or about one HP would be my guess with the voltage drop of the battery, so your battery would be seeing around 1000 watt draw to have a motor turn the engine over for that minute you are at a stop light.
You would be much better off designing your own auto stop/start.
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