Posted by ludgyy on January 17, 2011 at 22:03:46 from (50.48.48.105):
In Reply to: alternator posted by Gary Polivka on January 17, 2011 at 18:45:22:
Generally with tractor applications you want a smaller pulley because tractors run at a much lower rpm then a car. An alternator will produce the same voltage at different rpms, what actually varies is how much amperage the alternator will produce at a given rpm. With a tractor that just needs the battery(s) maintained and a few lights run, the pulley size doesn't need to be to exact just as long as it is spinning close to the desired rpms.
A delco alternator can be run the opposite way as what it is intended for and still work, however if too much load is put on it running backwards it can possibly overheat. again, with a tractor that just needs the battery maintained and maybe lights every once in a while it would be fine.
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