[Farmall] Coil On Super M

[E. John Puckett]

Since you have converted to 12 volts, I assume the system is now a 
negative ground ( - post of battery to ground).  If so, the - terminal 
of coil should now be toward the distributer, where the original system 
would have had the + terminal toward the distributor.  If that is 
backward it will shorten the life of the coil.  With the switch turned 
on, when the points are open you will have 12 volts at the resister, and 
on both terminals of the coil.  When  the points close the current flow 
should cause the voltages to change, with about 6 volts on the side of 
the resister toward the coil, and of course on that side of coil, and 0 
volts on the side of coil going towards the distributor.  This happens 
because the points actually ground that side of the coil.

DTerry3455 at aol.com wrote:
> What would cause a tractor to continue to burn up coil's. Has burnt up  two 
> in the last month,running a resistor with them, have twelve volts going to  
> resistor and twelve going to distributor on the negative side to  the coil 
> coming from resistor which is new, any help would be  appreciated.
>  
> Thanks
> Buddy
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