With the 7.3's the newer ones 99+ have better valve cover gaskets than the older ones, due to the glow plug pins are thicker. They will burn due to glow plugs going bad, which cause a higher amperage draw. So it sounds like you did the correct thing and replaced the under valve cover harness and glow plugs. What people dont look at is the engine harness that plugs into the valve cover. I'm thinking thats what shorted this time around once again melting the valve cover gasket. They are a pain to fix. They supposedly sell a pig tail kit that crimps on, but what i do is buy the repair kit from IH and crimp the pins on. (i remove the injector pins and move them over to the new harness plug, but i crimp new pins on the glow plug wires. The crimp tool is not very cheap. But my money is on the engine harness melting the valve cover this time around. You may be lucky and the inside harness is fine.
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