The 6V starters ground (1#14) the sol. to actuate it. The 12V ones have 2 (#14) contact posts, one is fed + 12V to actuate it & the other feeds +12V to the coil during the start processs.
Simply run up the Gen. & see. A 6V will put out 11 volts, a 12 will put out around 16.
The coil should be marked, but it doesn't matter if you use a 'ballast' resistor.
Good luck.
