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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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