You need a test light, that's a thing like an icepick with a wire clip on it and a light in the handle, any parts store will have several, about 5 bucks
check by clipping the clip to any ground, (Engine block etc) switch on he ignition and touch the sharp point to both sides of ALL fuses and breakers, when you find one with power at ONE end, but NOT BOTH ENDS.
you've got it
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I recently had this same problem. I had power to the switch, but the windows still didn't work. I checked the wiring and discovered that the problem was the ground wire to the window switch. I repaired the ground wire and the windows have been working since.
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