I have repaired and installed alternators for YEARS on ag and industrial equipment.
I use the 1N5408 diodes 'cause they are about BULLETPROOF. They are rated3 Amps @ 1000 PIV., which is WAY overkill for this application, but I don't see any failures with them. They cost so little to buy, for me it's not worth using lesser-rated units.
Some guys use diodes of much lesser ratings, but SEEM to get by with them, as low as 50 PIV. HOWEVER, when the ignition is switched off, and the magnetic fields in the ignition coil and alternator rotor collapse, the diode gets zapped with a pretty good spike of electricity.
Are you in Minnesota? If you need a diode, I'd stuff one in an envelope, and drop it in the mail to you, and you probably have it in one or to days.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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