Posted by John T on July 29, 2012 at 11:47:14 from (216.249.82.117):
In Reply to: which coil? posted by red tractorfan on July 29, 2012 at 10:56:06:
Contrary to what most lay persons think, on most of the circa 30's through 60' typical farm tractor ignition coils THERES NO DISCTRETE STAND ALONE "RESISTOR" HIDDEN AWAY SOMEWHERE INSIDE THE CAN.
There are coils designed for use at 6 volts nominal that can still produce a spark at cranking voltage which may be 4.5 volts yet still produce a spark and dissipate the heat at charging voltages of 7 BY THE WAY THOSE ARE LABELED 6 VOLTS. Many (not all) typical 6 volt coils have 1.25 to under 2 ohms LV Primary winding resistance 1.5 is common
There are coils designed for use at 12 volts nominal that can still produce a spark at cranking voltage which may be 9 volts yet still produce a spark and dissipate the heat at charging voltages of 14 BY THE WAY THOSE ARE LABELED 12 VOLTS. Typical LV primary winding resistance is in the range of 2.5 to 4 ohms, 3 is common
I dont think you will find any coils labeled 6 ORRRRRRR 12 volts !!!!!!!!!!!
THE EXTRA RESISTANCE IN A 12 VOLT COIL IS DUE TO MORE WIRE LENGTH OR HIGHER RESISTIVITY WIRE NOTTTTTTTTTT BY TUCKING A "RESISTOR" INSIDE THE CAN
ANSWER If its a 12 volt tractor you can EITHER use a 12 volt coil orrrrrrrrrrrrr use a 6 volt coil with a voltage dropping (12 to 6) extrenal ballst resistor therefore the coil sees only the 6 volts it was desgined to handle. T^here can be an advantage for cold starting if you use a 6 volt coil but by pass it while cranking !!!!!
Many 6 or 12 volt tractors still use the same 6 volt coil, its just that if on a 12 volt tractor they add the ballast
Got it?? Have to run to the Fair I will check back later for any questions
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