I'm assuming OE 5 pin ECU/4 terminal ballast. Tighten the 2 3/8" nuts on the ammeter & pull the yellow "ign" wire off of the starter relay to disable the starter (You know the starter works & no need to engage it & run the batt down for these tests plus the noise is a distraction). Have a helper hold the key to "start" & at that point (ign2 crank), 2 pins on the ECU need fire as does the coil positive primary terminal. With the ign key in run (ign1 run), 1 terminal on the ECU needs to be hot as does the same coil primary positive terminal but in "run" power goes to the end of the ballast that has the blue loop on it & on that end on the side that has the brown wire on the other end power flows from the blue wire loop to the brown wire on the end & flows out the other wire that's connected to the brown wire there on that end to the coil positive primary terminal. Need a VOM or a test light. If no fire work back to the bulkhead & seperate the halves & see if the terminals are clean & the firewall half has fire & if not seperate the pull apart electrical connector dangling under the steering column & check continuities. Holler back when you can.