I don't see how it could be anything but a 12 volt system if it has a 12 volt battery. The conversion of these tractors from six to twelve volts is fairly standard: 1. The 6 volt starter is left "as-is". (It will crank much better on 12 volts.) There are 12 volt diesel starters, but I've never heard of anyone using one on a conversion. 2. The 6 volt generator and regulator are replaced with a 12 volt alternator with an internal regulator. (Although mine uses a older Ford alternator with an external regulator.) I've heard of people using the 12 volt generator from a diesel tractor to keep the appearance orginal. 3. Either an external resistor is added to the coil circuit, or the coil is replaced with one that doesn't require an external resistor. Also, because the polarity is now negative ground (due to swapping an alternator for the generator), the primary coil leads need to be swapped. 4. The 6 volt starter solenoid needs to be replaced with a 12 volt unit.
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