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Polarizing a 6 volt Delco generator on a Massey 30

Someone had put a Bosch regulator on a 30 tractor I purchased years ago.  Somehow it got moisture in it and became badly corroded.  I just purchased a new regulator identical to the one that was on it.  I don't remember how to polarize it.  The generator has one wire coming through the housing and one post with a wire on it.  I don't remember which one is the field and which one is the armature.  Looking for advice.