Bill, I'm not sure of diode #. I just go to my box and grab a used ones. I may even have one I removed from my delco alternator and replaced it with an Idiot light. I like the light over the diode because I have all my tractor circuits fused. I can look at light and tell that alternator is powered up. One tractor I use same circuit to power up ballast resistor to coil. I would think a 2 amp diode would work. 5 would be plenty. The problem with using an alternator on slow running engines is you have to use the large B width pulley off old generator. Recently replaced 2 alternators, one on Jubilee and one on Farmall C. The newer alternators seem to have a built in delay. And both need a wake up call to charge. Wake up call is reeving the engine for a few seconds. Sometimes slowing the engine, alternator stops. The older style delco would begin charging, no delay, at an idle. George.
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