Here is my wiring for my SA using the Hitachi 14255, same wiring as the one you're using, just a little bigger. Any diode with at least 1A 50v rating will work, I used a 3A Radio Shack diode just because that's what was in stock. I added a 10 resistor in series with the diode just for protection in case I fat fingered the connector wire when testing. The resistor will protect the diode from momentary shorts to ground. Not required, you may want to not use it. I highly recommend a fuse at the alternator B terminal to protect your alternator, wiring, and battery.
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