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Ford 9N, 2N & 8N Discussion Board

Re: Re: Re: Resistor or voltage reducer?????

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Posted by Dell (WA) on October 25, 2000 at 08:10:59 from (

In Reply to: Re: Re: Resistor or voltage reducer????? posted by rbell on October 25, 2000 at 05:25:45:

rbell.........most ignition coils are designed to run on about 3 amps, no matter what the battery voltage is. Its kinda an ignition points area thing. The more current a switch has to pass, the bigger the switch contacts must be.

And then there is ignition transformer design, which is several levels of college courses on electro-magnetic theory, coil inductance, how to manufacture, etc.

Remember too, the infamous ballast resistor concept. An inverse resistance dependant upon tempature. Fords "better idea" to provide a "hotter spark" at start-up with a cold engine and a cold battery and cold outside tempatures. Battery power is reduced with tempature. Battery power is reduced with heavy current draw of a starter. Pretty soon there isn't enuff 6 volt battery power to power the ignition system at start-up. Vola' the ballast resistor, that automagically changes value with tempature.

Myself, if I were to convert to 12 volts, I'd use 12 volt designed ignition coils. Using a 12 to 6 dropping resistor is just a cheep way to convert to 12 volts.

But for the electrically challenged and the parts counter person challenged, asking for a 12 to 6 dropping resistor is a whole lot eazier than whipping out any form of electronic voltage regulator. But you can if you want to (grin)..........Dell

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