2007 FXSTDI Softail Deuce. 14,000 miles. Vance and Hines Big Radius Duals Kuriyakin Hyper charger with K&N filter Power Commander Anyone know how to tell if it's the coil? And if it is, would that cause the ECM Power fuse to blow? First problem I've ever had out of it since new! It is a single spark coil. I checked and there are 4 wires at the plug. What i have done so far: Put it in diagnostic mode to check for codes P- None S- U 10 16 SP- U 10 16 T- No resp (does not have a tach) Cleared codes and replaced fuse. Bike starts but you can clearly tell its only running on one cylinder. pull spark plug wires and determine it is the rear cylinder not firing. For good measure I also changed the plugs since it was time anyway. As I suspected, it wasn't a fouled plug. Also you can smell unburned fuel which I suspect is coming from the rear cylinder. Hopefully that means the injector is fine. Interesting note, it will sit and run (albeit rough!) no problem. But if you try to rev the engine, it blows the fuse and dies and resets the code on S ( U 10 16) every time, SP gets the code only sometimes. I have the shop manual with schematics. Thanks in advance!