Wow, I may not be smart enough to analyze your great question. So here are my initial thinking out loud thoughts then maybe we can conclude something:
It looks to me like for the two coil set up they are using two 6 volt coils in series since a 12 volt coil is more like 3.5 ohms while a 6 volt is like half that or 1.75 (they say 1 to 2 or 2 to 4). But that's for an automotive or tractor application, but still, their values and how its wired leads me to call them a single 12 or tWo sixes in series, albeit slight different ohms values then an auto coil
That being said, an auto coil is actually wired as an autotransformer with the opposite HV tower lead connected to one of the small LV terminal and the HV is therefore between frame (or which small terminal) and the HV tower output.
On the loss spark systems like Deere Pony motors used (and I think Onan Gensets) there was a single Primary + and - while the HV (NOT autotransformer) had one end to one plug and other end to the other plug.
BUT I HAVE NO IDEA HOW THOSE COILS ARE CONFIGURED, auto transformer or no connection from HV to LV like on Deere or Onan coils that fed 2 spark plugs with a single LV Primary winding???
AS far as high voltage, a 6 volt coil can yield as high a spark as a 12 volt, its all in the current and turns ratios so two sixes in series could still produce same HV HOWEVER IF THE COILS ARE WIRES AS AN AUTO COIL AUTOTRANSFORMER the HV would be between the towers and that center series tie point AND THAT MAKES NO SENSE.
I GUESS I HAVE TO KNOW THE INTERNAL HV AND LV THE COIL WIRING BEFORE I CAAN SAY MORE?????
Like Jim was talking if the 2 HV outputs are in series each is only 1/2 of the total but I don't see that as how the system works.
Im hungry were getting ready to grill some steaks, me and a buddy are in our RV's up in Minnesota somewhere but I will check back later. Maybe yall have the answer ??? but how those coils are configured is key, are they autotransformers or open HV ended like Deere pony motor coils or what???
John T I know some things (darn few lol) but I don't know everything
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