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Ford 9N, 2N & 8N Discussion Board

Re: 46 2N coil

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Posted by Charles Krammin on January 23, 2013 at 17:46:06 from (

In Reply to: 46 2N coil posted by Tom Beddard ENC on January 23, 2013 at 17:11:21:

Are you using the right terminolgy, when you state 2 ballast resistor? A 6 volt coil in a 12 volt conversion, requires a 12 volt stepdown resistor to 6 volts (acts and looks like a ballast resistor), but with more resistance than a standard ballast resistor and the 2 in series (out one, in next one), apply the needed hot running resistance to a 6 volt coil. Testing resistors, resistance with a digital tester (when cold) might determine this. Testing the "voltage to the top of the coil" (when running), with an analog (dial type)meter should be about 4.5 volts. (digital tester give eratic measurement, when running.)
I feel these 2 resistors (12 to 6 volt and ballast resistor), with a 6 volt coil are a better choice than a 12 volt coil, with a ballast resistor since more of the heat is disapated in the resistors, than the coil. The front mount coil also suffers from more heat from the radiator
If you have 2 "standard ballast resistors" you do not have enough total resistance for a 6 volt coil, which will cause overheating and failure at operating temperature.
My experience is that it is hard to find a good square front mount 12 volt coil, but if you do switch I would recommend the ballast resistor.
Personally I like the 6 volt "original FoMoCO" resistor as I feel it has a better insulator between the windings.
Charles Krammin SW MI


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