With a Delco, I use 3 Amp, 1000 PIV diodes (1N5408) which are WAY overkill, but I've never had a failure, as opposed to using, say a 1 Amp, 100 PIV diode which WILL occasionally fail, apparently from voltage or current spikes.
I buy the 1N5408 iodes in bulk, typically for about $.05 so "overkill" doesn't cost much here!
The PIV (Peak Inverse Volts) rating has to do with the highest reverse voltage spikes the diode can live through, in general, the higher the better, at any rate you'll want to be WELL above 12 Volts.
The AMP rating is the amount of current the diode can handle in the forward direction, when exciting the alternator, which can take perhaps around 2 Amps.
NO reason a similar diode wouldn't work with about ANY internally-regulated alternator.
For a (-) grounded system, the CATHODE (white-banded) end goes to the alternator, as shown here with a Delco alternator.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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