A ballast resistor has very little resistance when it is cool (very little current passing through) so a volt reading will show close to 12 v . Now if the points happen to be closed when you turn on the key then the resistor will get hot, ohms will increase, voltage will drop. Last but not least, some starter solenoids have an extra terminal that is only energized when the starter is engaged. Hook that terminal to the coil side of the resister.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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