'65 up Ford tractors used a resistance wire in the harness between the key switch and the coil, AND a non resistance wire from the "I" terminal on the solenoid to the coil. That way while cranking, the coil was supplied with extra voltage making a stronger primary side magnetic field, providing a higher secondary voltage (spark). We used to stock them (the resistance wire) as they had a habit of melting the insulation off when the key was left on by mistake and the points happened to be closed.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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