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gblj

Member
I just bought a coil for my 8n it says 6v on it the one I took off says 12v, without the risk of sounding dumb is there a difference? my system on the tractor is 6volt.
 
If it is a 12v coil for use with an external resistor, it will work fine on 6volts (without a resistor).
If it is labeled for use without a resistor, it will not work, or it will work poorly. JimN
 
Jimbo has ya covered I will just add Ive seen different confusing coil labels: Some are labeled "12 volts for use with (or requires) external ballast resistor" which are in reality 6 volts coil and are fine on 6 volt tractors. Others are labeled "12 volts NOT for use with external ballast resistor" which are full true 12 voot coils and will not work good on 6 volt tractors.

If the coils primary resistance measured between its lil + and - terminals is around 1.25 to 2 or so ohms its a 6 volt but if its more like 2.5 to 3.5 ohms its a 12 volt coil and needs 12 volts to work correct.

YES theres indeed a difference in 6 and 12 volt coils, put 12 on a 6 without any external ballast and it will overheat, put only 6 on a 12 volt yields a weak spark.

John T
 
I can not agree with the above statement. There are 6 volt coils, 12 volt coil for used with and external resistor, and 12 volt coil with an internal resistor. THE ONLY INTERCHANGE is that a 12 volt coil for uses with an external resistor can be used to replace a 12 volt coil with an internal resistor IF a external resistor is added. The 12 volt coil for uses with an external resistor IS NOT A 6 VOLT COIL.

Kent
 
Fill in the one big gap you left on info. Is it a front or side mount distributor?? Makes a big difference as to what is what. If its a front mount there is no true 12 volt coil made for them. If its a sdie mount there are a number of them made that can be true 12 volt or true 6 volt. I'll take a guess yours is a front mount so to answer your question that 6 volt coil will work just fine
Hobby farm
 
No room inside a coil for a resistor.The heat from the resistor would overheat the coil.A 12v coil is wound with more turns of finer wire on the primary.This gives a higher DC resistance to keep the current at 3 amps.
 
If there was more turns with finer wire, the turns ratio of the coil would be off and the output voltage of the two coils would differ. This is one place where I take the manufacture work that there is a resitor in a coil maked WITH INTERNAL RESISTOR.

Kent
 
Secondary turns can be reduced to keep voltage at proper level .Its plain that you know zip about transformers.I started in electronics in 1950...About half the info on forums is BS repeated by posters who have zero knowledge.
 
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