94 No Power to Locks, Windows, Seats and other places.

I’ve got a 94 GT. The power windows, seats, door locks and convertible top are all without power. What could it be? I’ve replaced every fuse in the fuse box and all the switches. Has anyone else been though this, I’m about to pull my hair out and I don’t have much left
 
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Have you checked to see if you have 12V on the power side of the fuses with the key-on? It sounds like you've had a power distribution relay failure, but I'm not familiar enough with the wiring and power distribution on these cars to say for sure.
 
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I would start by checking
The main loom by the battery and the fuse links under the hood at the starter relay
Check the fuse links one at a time by pulling on the wire (they melt inside) and then get rubbery
Check the harness (loom) for corrosion