Posted by John T on October 05, 2008 at 13:40:06 from (71.126.205.21):
In Reply to: COIL posted by gblj on October 05, 2008 at 13:05:18:
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.
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