Checking the "start" side: take off the yellow "sol" wire from the starter relay to disable the starter to keep from unneccesarily running the batt down. Take off any/all wires from the coil neg primary terminal and with a jumper wire w alligator clips on each end/clip one to the male pri neg coil terminal and tap tap the other clip to ground repeatedly like Morse Code as a helper holds the key to "start" & if the coil secondary wire (dist end) held 1/4" from ground sparks this tells you the ign sw/coil/their supporting wiring (the "start" circuit) is good and that the prob is the ECU/ECU ground/dist pickup or one of their supporting wiring circuits. Holler back & more later. In a 5 pin ECU/4 male terminal ballast system (2) terminals in the ECU must be hot in "start" + bypassed 12V to the coil positive pri terminal