If you wire it as a three wore alternator you don't have to worry about ordering a different pulley. It will start charging on start up. Most of the time with the one wire though at start up the engine is usually revved up enough to start it charging before idling back down.
It's really not enough of an issue to hunt a different pulley when you have one that will be fine. Putting it in reverse or lwo to take off will give enough rev to make it turn on.
But Hotrod is right, using a smaller double v-belt pulley will turn the shaft faster making it turn on usually without revving the engine.
Last edited by Roy Rodgers; 11/22/2014 4:03 AM.
