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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