Posted by pete 23 on March 21, 2009 at 11:03:20 from (173.87.1.12):
In Reply to: Farmall M overcharging posted by Shawn in PA on March 20, 2009 at 21:40:03:
More than likely it is caused by a poor connection at or feeding #2 terminal as other posters have stated. Just to add some things here, several years ago when the internal electronic voltage regulators were new to the ag field, I did some expermenting with alternators on the test stand, by inserting a potentiometer in series to the #2 termanal I was able to simulate poor connections by varying the resistance and the voltage would rise to over 18volts. When these connectors on the alternator are exposed to operating conditions and weather, a little rust and corrosion can really drive that regulator crazy.Good reason to put something on connector to seal it. (vasoline or grease works) On another note, about two years ago a supplier of alternators and parts had a bad batch of parts from some where (china) and these alternators were cooking batterys like crazy. Last year I put a rebuilt 15 SI on for a guy and shortly after it was pegging the volt meter, after checking connections I installed a new regulator, better but not good, another new regulator from a different supplier, still not right. Put on a spare alternator I have worked perfect. As we all know the regulator controls the current flowing through the rotor to control output so I replaced the rotor, still no go.Of course, every time I took it apart I double checked diode trio , bridge and stator. Got him a different alternator, and it is working fine. Some times you just have to give it up. If the alternator in question was put through all the tests on a test bench it should be fine (of course, I have no way of knowing what tests were performed) so we come back to connections.
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