[Farmall] Coil On Super M

[E. John Puckett]

All of the coils I have seen were higher resistance than the measured 
resistance of the coil.   The reason for that is that as the engine runs 
the magnetic filed rapidly building and collapsing in the coil every 
time a spark plug fires causes reverse EMF (actually a fancy way of 
saying the coil tries to send electricity backward into the supply), 
which makes it the same as if the coil actually has a higher resistance 
when running.

Stan Bass wrote:
> On our 4cyl Farmalls, the 6V coil is about 1.5 ohms, the 12V coil with internal resistor is about 3 ohms, the inline resistor with a 6V coil on a 12V system would be 1.5 ohms. The exception to that would be one of the variable resistors that starts at about 0.5 ohms for more punch at the cold start, but then increases it's resistance to 1.5 ohms as it heats up.
> Stan(VA).
>
> --- On Thu, 6/3/10, Mike Sloane <mikesloane at verizon.net> wrote:
>