Posted by jdemaris on October 15, 2009 at 18:32:25 from (72.171.0.145):
In Reply to: Diode Question posted by Pete7 on October 15, 2009 at 16:32:37:
What's your reason for the diode. Are you trying to prevent reverse flow of power that stops you from turning the ignition off?
Sounds like the diodes in that pack are the cheap 1 amp diodes. The field-exciter circuit can run up to 3 amps, and can blow those little diodes.
Doesn't your Radio Shack store have their diodes listed by amperage or wattage? Mine does, and they have plenty in the 3 amp and 5 amp range. The 278-1661 that the other poster mentioned is a 5 amp diode.
Any alternator or motor repair shop will have boxes full of them.
If you want to use them up, now that you have them, just take 2 or 3 of them and hook all in parallel. Three cheap 1 amp diodes hooked together in parallel will be equals to one 3 amp diode.
Any diode/rectifier will work as long as it permits current one way, stops the other, and is big enough to carry the current.
If you use an automotive type ignition switch, you don't need any diode to block reverse current. Just hook the IGN terminal to your ignition (assuming you've got battery ignition), and hook the ACC terminal to the exciter wire to the alternator. This way, the exciter is totally isolated from the IGN when turned off.
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