Posted by John T on September 20, 2017 at 10:33:37 from (216.249.81.101):
In Reply to: 6 volt change to 12v posted by craig45 on September 20, 2017 at 09:46:54:
Craig, good question "do I need a new coil or just a resistor"
ANSWER : You can EITHER use the existing 6 volt coil but add ahead in series between the IGN switch and the coils input a discrete bathtub style voltage dropping (12 down to 6, many in the 1.2 to near 2 or so ohms resistance) ballast resistor, that's the cheapest method ORRRRRRRRRRRRRRRRR you can get a new full true 12 volt rated coil (NO ballast required) many typical old farm tractor 12 volt coils have somewhere around 2.5 to 3.5 LV primary ohms as measured between the 2 small + and - terminals.
NOTE since this is an old tractor forum NOT an old car forum, I'm talkin "typical" old farm tractor coils NOT old American car or truck coils, some of which used 6 volt others used 12 volt, and some had different resistances then above and also different ballast resistances to match the particular coil and ballast together.
NOTE most all typical old farm tractor coils DO NOTTTTTTTTTTTT have an internal stand alone discrete ballast resistor tucked away and hidden inside the can, even though some refer to them as having an internal ballast. Typical old farm tractor 6 volt coils have around 1.2 to under 2 ohms LV primary resistance while a typical old farm tractor 12 volt coil will have more like 2.5 to under 4 ohms.
Wire whichever coil to match the tractors polarity
NAPA or O Reillys or Tractor Supply or Rural King etc etc stock BOTH 6 and 12 volt rated coils
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