Dalex said: (quoted from post at 20:20:39 07/08/10) You can use an oil pressure switch to turn on the alternater on a mag equiped machine. Then you don't need the diode.
If you have a magneto you don't need a diode anyway. The diode is only to prevent backfeeding the ignition coil so that it shuts off.
With a magneto there is no switch to supply voltage to the alternator to get it to start to charge. By using a two pole, normally open, pressure switch you can apply battery voltage to one side and connect the other to the light/excite terminal terminal on the alternator. That will allow the alternator so start to charge once there is enough oil pressure to close the switch. When the oil pressure drops the switch opens the circuit so the battery doesn't discharge when the engine is not running.
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