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<DIV>Most 12-volt systems (except DIY conversions) with a ballast resistor have
a circuit to bypass the resistor while starting. This compensates for any
voltage pull down caused by the starter and provides a hotter spark for
starting.</DIV>
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<DIV>Jim Becker</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=rvar@plainstel.com>Kurt
Musgrave</A> </DIV>
<DIV><B>Sent:</B> Monday, May 11, 2020 1:16 PM</DIV>
<DIV><B>To:</B> <A title=at@lists.antique-tractor.com>'Antique Tractor Email
Discussion Group'</A> </DIV>
<DIV><B>Subject:</B> Re: [AT] Project Updates '49 A, '51 A, and '47 B (STEVE
ALLEN)</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoNormal><SPAN style='FONT-FAMILY: "Tahoma",sans-serif'>>>You
are correct Carl. A 12V system takes a 12V coil with an internal resistor
or and external 1.4 ohm resistor commonly called a ballast resistor can be used
with a 6V coil. These are available at most auto parts
stores. This is to avoid burning the points as you
say.<<<o:p></o:p></SPAN></P></DIV>
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<P class=MsoNormal>I never really understood why the ballast resistor, always
seemed to me it would have been just as easy and probably cheaper to have just
made points capable of handling the 12 volts, instead of the ballast resistor
and the associated hassles.</P>
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