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Do you have a trailer hooked up or maybe the trailer wiring harness/connector is wet or corroded? Genuine Ford relays?
You have probably checked the connector tabs that the relays plug into? I have seen them get corroded up with a chalky deposit. You should run a very thin file into them, like the old school point files. (even a small knife)
After that the next thing to check may be the main ground for all the relays in the fuse box. For my 97 (yours should be similar) it's called G201 and it's located (according to Alldata) behind the RH side of the instrument panel. There also is a huge 15-20 wire ground splice (S205) in that area as well.
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