I built an electronic ignition set up about 4 months ago and its been literally blowing up coils. GM TBI coil, GM HEI 4 pin module, new relay (triggered by original coil wire) 10ga wire from battery to relay and then from relay to 12v side of coil. Duraspark pickup conversion in the holley distributor. Just like the write ups here. All of the parts are about 4 months old except the coils. They were original GM parts. All parts grounded to a large aluminum angle that its all mounted to. I'm just trying to figure out what could be causing the coil blow ups. Has anybody experienced this or have any insight?