Okay, this is for laughs and sympathy, I know what to do. Got the under cabinet and over cabinet lights all wired. Flip the switch and YAY, lights everywhere EXCEPT over the sink. It's supposed to be on the same switch as the under cab lights. No dice. So now, I have to go into the wall from the bathroom side and find what I'm pretty sure is the wire stub to nowhere. There's no back-splash in the kitchen but that wall was sheared with 3/4" ply. The only thing that will partially save my sorry butt is that the medicine cabinet cavity is exactly behind the over-sink light. I'll remove one of the studs that make up one side of the cavity and get my flashlight in there. Shoulda taken those pictures. AARRGH!