I am kinda curious how the high voltage electricity is getting from the coil back into the small low voltage wires of the Hall Effect sensor. I've had mine apart and can't see the electrical path it would take in doing this. What I have found, in most cases of failing to properly provide a path to ground at the end of the plug lead, is the spark will jump inside the coil burning the thin insulation on the windings making them fail and then arcing will begin happening inside the coil even with the plug connected. In the case of the RcExl, it's ruined, in the case of the CH it can be taken apart and the spark coil can be replaced. Been there done that. If someone can help me understand the path back to the Hall Effect it would be appreciated.