The alternator is a fixed magnet type and must have a rectifier in it because I get a DC voltage reading directly from it. The tractor also has a voltage regulator with a 6 prong connection.No. You haven't provided enough information. What you described in your first post could be considered normal. We don't know the tractor or whether it has a generator, alternator or even a regulator. Some alternators have the regulator built in.