[AJD] Stupid questions 6v vs 12v B

[Paul Sawyer]

Ok y'all. I have some stupid questions. 

How do you tell if a tractor has been changed to 12v?  The people who did the work on the tractor aren't here anymore so I can't ask. It has a 12v battery but a 6v JD coil. I can't see anything on the alternator/generator as it is heavily painted. There is a white ballast above the coil. That cuts voltage, correct?

The tractor is a 51 B. 

Help!  

If it isn't 12v, I want to move it there. 

-Paul

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