you saying if you disconnect the tach wire the coil does not spark? how come ive not had the tach wire connected on several cars ive had and they all run fine? certainly if you dissconnect the other wire going to the ecu, it will not run. and as for bridging out the reylay, there is nothing wrong with it! how else would you fault find the system, of course there are many tards out there that can set fire to things and hurt themselves, and if the OP falls into this catogory may i suggest he does not fault find anything, and gets someone else who wont kill themselves off of 12v to look at it.