OE 5 pin ECU/4 terminal "dual" ballast or 4 pin ECU/2 terminal "single" ballast setup? pull the yellow with tracer wire from the starter relay to disable the starter and turn the key on and (1) the coil positive primary terminal and (2) the blue/yellow ECU terminal must be hot in ign1 "run" for the ign to function. If not, check the bulkhead & work forward or backward to find the open. grab your meter. EDIT only need to pull the yellow w tracer wire off of the "ign" terminal on the starter relay if you are checking things out in the ign key to "start" position. I'm just so used to checking both back to back