My '73 Power Wagon has no spark, I had it running and it stalled out and lost spark. I have replaced everything under the hood with good known parts. I have no power on either side of the coil, no power on any of the ECM pins, and no power to the ballast resistor. I do have power to my starter relay and the large wire on the alternator. I just ran a jumper wire from the + battery to + coil. Now I have spark, and my test light shows power to both sides of the ballast resistor, both sides of the coil, and 3 pins on the ECM plug. What could possible be wrong, this ones got me stumped!