Re: 10-SI excite voltage?

Posted by Janicholson on January 17, 2018 at 18:10:26 from (63.152.194.8):

In Reply to: Re: 10-SI excite voltage? posted by PJH on January 17, 2018 at 16:51:30:

Not Jon, but a diode has three options: it can work as intended allowing its rated amps to flow in the forward bias direction and preventing all but a very tiny minuscule flow in the reverse bias, it can go open and not conduct at all in either direction, or it can short, conducting in both directions. In this application it is really not a problem if it fails in the open condition, the alt will just not excite till the RPM get high enough to self excite. With today's rebuilds it may do this at a very low RPM anyway. If it fails shorted the tractor will not shut off, which is not a catastrophe. If the alternator regulator fails and the when it did the unlikely happened and the #1 terminal would go to ground, it could allow its rated current to be drawn from the ignition circuit. This would burn out a 4 amp rated diode and thus act as a fuse in a circuit that can probably handle 8 amps. If the alternator failed open nothing happens except there would be no charging. If it were attached to the coil side of the ballast resistor, and failed shorted, it could take the ballast resistor out as well, but I think that is all. I have seen no alternators fail with ground at the #1 terminal. I have seen no diodes fail in this application. That is my opinion. Jim

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