Dear John With no disrespect, there are no internal resistors in coils. The 12volt for use with no external resistor does not imply that there is an internal resistor. There is not. It is just wound such that it can operate on full 14.2 volts of an operating charging system. Bud's tractor has a 6 volt coil of unknown operational status. (we think it is bad) he needs either a new ballast resistor, and a new coil, or a new coil only. If he purchases a 12v No external resistor required coil he can dispense with the ballast resistor all together. That is part number MPE IC 14SB (no resistor required 12v. Jim
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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