This is on a farmall M that I am redoing. It is converted to 12 volt negative ground. I got a repro stock coil from Steiners for this thing and it was recomended to me from their service techs to have a balast resistor in the line going to it. I am running about four feet of 10 gauge wire from the resistor to the coil and it sure has a weak spark from the coil to the plugs. I ran a jumper from the starter to the plus side of the coil along with the low voltage wire and it will fire real good as long as the starter is engauged, when I let up on the starter the motor will not hit. I am thinking that I have to long of a run on small wire going to the coil. What do you fellas that really know your electricity think. I value your knowledge alot on this board. Thanks in advance, Animal..