Yes, the vast majority of 12 volt systems in the USA use what you are calling a "6 volt" coil. More then 75% of all cars and trucks with breaker points used that style. Same coil in a Deere 6 volt tractor is used in a Deere 12 volt tractor.
A 12 volt system has to make spark at 9 volts when cranking and at 13-14 volts when running. So various systems use differing strategies to accomplish the task. Ballast resistors, differing values in the primary and secondary windings, etc.
If you look closely, many 12 volt coils for sale also list usage for 6 volt systems.
The so-called "12 volt" coils have a higher resistance in the primary windings inside the coil and thus do not use an external resistor.
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Today's Featured Article - What Price Enthusiasm? - by Anthony West. Quite frankly, for some time now restorers like myself have become more and more concerned about the rapid increase in the prices of old farm machines here in England. There is now a growing market for "As found" machines. Which as machines get rarer, has found the birth of a new industry....one of the "procurement agent". These agents appropriate as much old machinery as possible then inflate prices at auctions. So at what price enthiusiasm? We are now seeing poor machines which 3 years ago ma
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