Polarity is not important. If the tractor charges at all, it is connected correctly. They do not care which terminal is ground if they are polarized correctly for that ground, and it is. If it is setup to use a voltage regulator, the field terminal should go directly to the smaller terminal on the gen. If it goes other places, it is wrong. If it has no regulator, but has a 4 position light switch, LHDB, then it has a cutout relay with two terminals, and no regulator. The switch for the lights also controlls charge rate. L (the first position CCW on the Switch) is low charge and will be as you found, low amps to maintain the charge after it is charged up. The second position H is high charge, and will usually pump out more like 12 to 15 amps. The D position, and B positions are for lights and also cause high charge. Though the lights draw this down to maybe 4 or 5 amps into the battery. If it has a regulator, and it is connected directly to the gen, the regulator may need adjusting (by a knowledgable elecrtical system tech), or replaced. Let us know how it turns out. JimN
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