Dean, Im unfamiliar with that Hitachi alternator, not sure if it requires initial external excitation like the GM 10SI family or not?????? If so, see below:
On the GM I prefer the current limiting (a bit of a safety factor) of a 10 to 47 ohm 5 watt resistor instead of a diode. (5 watts isnt required but has bigger tougher easier to wire leads) It can BOTH limit current PLUS prevent ignition backfeed if required such as on the GM 10 SI family of alternators (again unsure on the Hitachi)
Another option instead of a diode or resistor is the use of a small incandescent "idiot light" which serves THREE purposes,,,,,Gives you "some" indication of charge (on when not charging, off when charging),,,,,,,,,,Excites the alternator if required,,,,,,,Provides some degree of current limiting protection.
As far as Polarity on the diode, for it to work, for Neg ground its cathode must be on the alternator side NOT from the ignition
Bob has ya well covered as far as size and a neat picture, if you use a resistor or idiot light instead, it simply replaces the diode
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