So looking at Kens diagram and your comment about the original resistor, would I be correct I wonder in saying the run wire (blue) has been disconnected from the 2 pin resistor and is now running to the 4 pin resistor? I have labelled it as Ignition (Battery) but it's actually ignition run. That is then connecting via the 0.5ohm side to the coil just like a 2 pin resistor would then looking at my photo is it possible he has wired the start wire (in the photo the red wire with white stripe) to the 5 ohm side which because it has a jumper to the 0.5ohm side also connects it to the coil?