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Farmall & IHC Tractors Discussion Board

Re: 6 volt system, has a 12 volt coil


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Posted by John T on November 24, 2007 at 06:11:43 from (66.244.83.147):

In Reply to: 6 volt system, has a 12 volt coil posted by MikeK on November 23, 2007 at 20:15:32:

Mike, a 12 volt coil will produce a spark if only supplied with 6 volts but it will be weak and no, I dont see that as the cause of your condensor problems. Ive seen coils labeled:

"12 Volts NOT for use with external ballast resistor" which are indeed full true 12 volt coils

"12 volts for use with (or requires) external ballast resistor" They are indeed actually 6 volt coils and such will work fine on a 6 volt tractor. They are used on 12 volt tractors that use a 6 volt coil and most have the start by pass feature which allows for a hotter start up spark, They sort of start on 12 volts and run on 6 volts.

Theres a common misperception (old wives tale) out there that all coils are 6 volt coils simply NOT true. A full true 12 volt coil has a primary winding resistance (measured between its lil + and - terminals) of around 2.5 to 3.5 ohms or so while a 6 volt coils is more like 1.25 to 2 ohms. ALSO some people refer to 12 volt coils as "internally ballasted" which some think have a built in discrete ballast resistor wired in series before the coil winding HOWEVER most achieve the added primary winding resistance simply either by having more primary wire/winding length or else use wire having a higher resistance per unit of measurement.

One limiting factor and the reason 6 and 12 volt coils are indeed different concerns the life of the ignition contact points which is limiting the current they are required to switch unde load to around 3 to 4 amps or so..... Thats why a 6 volt coil has say 1.5 ohms or primary resistance 6/1.5 = 4 amps) and a 12 volt coil say 3 ohms (12/3 = 4 amps)...... AND THEY ARE NOT ALL THE SAME 6 VOLT COIL........

BOTTOM LINE you need a 6 volt coil on a 6 volt tractor cuz a 12 volt coil will produce a weak spark. All coils are NOT 6 volt coils, see the explanation and reasons why above

Yall take care now

John T


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