Posted by John T on July 10, 2012 at 17:58:49 from (70.91.171.21):
In Reply to: 6V vs 12V coil posted by rrlund on July 10, 2012 at 13:22:47:
There is INDEED a difference. If you go to NAPA and ask for a coil they will ask if you want a 6 or 12 volt, they WILL NOT SAY WE ONLY SELL ONE FOR 6 OR 12 THEYRE ALL THE SAME !!!!!!!!! (yeah right)
a) There are coils designed for operation at 6 volts nominal that will handle the current, dissipate the heat and produce a spark at cranking voltage which may be 4.5 volts yet still operate at charging voltages of 7 volts, their LV primary winding resistance will be in the neighborhood of 1.25 to under 2 ohms, many around 1.5.........
b) Therre are coils designed for operation at 12 volts nominal that will handle the current, dissipate the heat and produce a spark at cranking voltages of 9 volts yet still operate at charging voltages of 14 volts, their LV primary winding will be in the neighborhood of 2.5 to under 4 ohms, many around 3 ohms............
I challenge anyone to find a coil labeled 6 OR 12 volts (yeah right). Coils may be labled 6 volts,,,,,,"12 volts for use with an external ballast resistor (or requires ballast)" or "12 volts NOT for use with ballast (or no ballast required)......
HOWEVER many 6 and 12 volt tractors still uee the same 6 volt coil butttttttttt if on a 12 volt tractor they add an external series voltage dropping (12 to 6) ballast resistor which drops 6 volts leaving 6 on the coil as a 6 volt coil is designed for DUHHHHHHHHHHHHHHH
So go to NAPA and see if they have "6 or 12 volt" coils?????????? NOOOOOOOOOOOO they make em to operate at 6 ORRRRRRRRR 12 volts NOTTTTTTT whichever you happen to like lol
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