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331..... ...in 1939 when the N-Tractor was designed, they didn't have "DieHard" batterys, so Ford used their secret trick "infamous ballast resistor" and designed their 6-volt squarecan frontmount ignition coil to run on about 3.2 volts. The ballast resistor is internally temperature sensitive and magically changes resistance from about 0.7 ohms when cold to about 1.4 ohms when hot. This means the OEM 6v frontmount coil gitts more volts when it is cold and the battery is weak from starter drawdown and therefore you gitt HOTTER SPARKIES for starting the engine. The "infamous ballast resistor" just looks like a coil because it is eazier to manufacture all coiled up like that. And yes, the infamous ballast resistor keeps the coil current in check with a resultant voltage drop. Ohm's Law still rules. The common and popular Delco 10-SI alternator with built-in voltage regulator was designed from the gitt-go to use a switched exciting voltage regulated by the dashboard IDIOT-LITE. The trailer marker light comes with wires already attached and makes a simple to installed IDIOT-LITE to prevent the alternator guttz from feedbacking volts to the ignition coil so the engine turns OFF when you turn the ignition switch off. Simple, eh? Yes, any 6 volt ignition coil NEEDS a 12 to 6v converting resistor to run on 12 volts. The 6v squarecan frontmount ignition coil needs BOTH the "infamous ballast resistor" AND a 12 to 6v converting resistor wired in series like flashlight batteries..... .....HTH, Dell a 12v advocate for the right reasons That said, I haven't found the right reason for my eazy starting 6v 52 8N and I know how to do it right the first time. In fact, I know 8-ways to do it and they all work the first time.
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