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Fisherman, just because its Positive ground, that dont determine whether its 6 or 12 volts, most old tractors, 6 or 12 volt, still used Positive grounding. Also, the genny will work at EITHER ground so long as its Polarized. If it had a 12 volt battery in it, I would suspect it may well be a 12 volt genny, I guess you cant find any labels on the genny or Voltage Regulator?? You asked about not frying something, you may wanna see if you can determine if you have a 6 or 12 volt coil and if theres any external Ballast Resistor in the ignition circuit wired ahead of the coil?? If its a 12 volt coil or you find an external ignition Ballast Resistor, thats a darn good indication she was converted to 12 volts, although it still dont tell ya if they changed the genny. If you put 12 volts on a 6 volt coil without the ballast, the coil will run very HOT and the points will burn up quicker, so that may be one of the dangers you need to look into. Other then 6 volt lights would burn up on 12 volts and possibly damaging a Voltage Regulator, youre probably not gonna do much more harm if you connect 12 volts on a pure 6 volt system. A 6 volt coil would read around 1.25 to 2 ohms or so between its lil + and - terminals while a 12 volt internally ballasted coil will read more like 2.5 to 3 and over if you have an ohmmeter handy. Let us know how things turn out John T
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