The biggest electrical issue the 2003/04 Expeditions have is the fuel pump relay connection in the passenger side box. If it we're me, I'd replace the whole positive cable, not just the terminal end. On a lot of these Expys, corrosion gets inside the cable. Replacement cables are available aftermarket, so no problem there. I also use those felt washers under my positive and negative cables. My battery stays clean as new on top.
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Great idea and I do believe the dealer replaced both battery cables, then 'built' the fusable link into it since they could not find a factory or aftermarket harness.
It's early here right now (dark out), but I'll take a picture later today. I asked the service adviser to point out their work. The work really looked top notch.
I was always suspect of the that harness when I would do under-the-hood inspection. Fluids, looking for anything funny.