Posted by JMOR on April 09, 2009 at 07:20:08 from (72.181.158.237):
In Reply to: Farmall 460 coil posted by Allan In NE on April 08, 2009 at 06:53:45:
I've never opened one up that wasn't copper wire. I have no doubt that they all use copper wire of varying gauge, turns, length to achieve the desired properties. A surprise to many is that the use of an external resistor actually has a stabilizing effect on coil current, helping to keep it more constant as it's copper wire resistance increases with temperature, than no resistor and copper windings only. This very likely has a lot more to do with the industries use of resistor plus coil than the idea that they just added the resistor in order to be able to use same old 6v coils on 12v systems. It also made it nice to be able to bypass the resistor during cranking when starter drags battery voltage from 12 down to perhaps 8 or 9 volt range or from 6 to maybe 4.
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