So I have a Ford 8N with with front mount coil. The other day I was in my Garden and the tractor started acting like it was starving for power. I thought maybe my coil was wearing out so I put the old 6v coil that was on it before I converted it to 12 volt and it ran fine.I ordered a new 12 volt coil and when it came in I slapped it on and the tractor would not even fire. I put the 6v coil back on and it fired right up. Replaced the ?? defective 12 volt coil with a new one and same thing. No fire. I am currently running my 8n on what I think is a 6 volt coil. Why will these 12v coils not fire on my converted system. And yes I do have the white resistor mounted on the side of my tractor. Any body got any ideas why??