Posted by John T on May 17, 2011 at 09:18:20 from (173.243.189.183):
In Reply to: external resistor posted by Henryv111111 on May 17, 2011 at 06:47:05:
Henry, the answer is probably YES PROVIDED the ballast is the correct resistance to match the 6 volt coil and the points are closed. If the ballast is approximately the same resistance as the coil, you would have a 50 50 voltage divider so theres 6 volts dropped across the ballast leaving 6 for the 6 volt coil when the points are closed and conducting current. Many coils labeled 6 volts have around 1.25 to under 2 ohms primary resistance while a typical 6/12 ignition ballast resistor is in the same ohms range SO THE 50 50 6/12 VOLTAGE DIVISION IS ACCOMPLISHED.
Of course, the exact answer depends on the coil and ballast resistance and a good set of closed points but you are on the right track assuming its a typical 6 volt coil and typical 6/12 ballast system.
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