Electrical Problems EEC Fuse Blown

1993 ford thunderbird lx 3.8 EEC FUSE KEEP BURNNING OUT I'VE CHECKED ALL THE WIRE from the fuse box back in to the firewall and there no evident of burn wires and i;ve trace all wires coming form tht area but under the fuse box under the hood one of the yellow wires seems to be swolen from to much heat but i trace it to the ecm and there is spark coming for the fuse box to the coil but still no spark from the coil i had my alternater checked if anything was grounding in side but seem to be find so i ruled out the alternator i still have tht short in the EEC FUSE AREA and can't seem to find where the short is coming from i need help thanx