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Hi, I am Mike, welcome. I'm reviewing your question.
Check for voltage again at the splice S231 located In window regulator relay switch harness, near breakout to C248
C248 is left side of dash shown here,
Here is that wiring diagram ,
Is this is a stripped chassis that is splice s283
depending on whether not not you find voltage there then you will need in what direction to test next or quite possibly the problem is right there at that splice.
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