Some of you may remember that not too long ago I posted up that I had a bleedback in the electrical system, which let the overheat/low oil pressure buzzer go off continously at about half normal volume,whenever the batter switch was on. As usual, several on here diagnosed correctly, and I found a bad diode in the alternator. Good news is, took it to Auto Zone, for a check out, and was hoping to find a replacement without having to buy something that was listed as marine. Diagnosis confirmed, alternator was bad, and their big, and I mean big, cross reference book came up with a direct replacement. Only difference is a small adapter for the ignition lead had to be switched over. The best news is the replacement cost is 60 bucks, with a lifetime warranty. This was a Hitachi alternator on a 3gm Yanmar. I would recommend that anyone needing an alternator, give a cross over book a try. This is the exact same alternator, with the exception of the small plug in adapter.