Not questioning your ability but did you put a power source directly to the window motor or harness. Or did you just check+test w/voltmeter?
Once again, just trying to be positive+helpful b/c i had this problem and it was just my D/S switch. I actually have two good motors in my parts s14. If i dont sell the whole car with another s14(as a package) i will let you know if not so i can hook you up. Good luck.