Trying to get the over-the-sink light to function along with its switch. Lots of black wires, white wires and grounds. One white, one black and one ground for the light receptacle. Having trouble determining which black is the power wire I need to connect to the black of the receptacle. Don't know at this point if the switch works because it does not appear to have power to it even though it is connected properly. Help, am going nuts (4 weeks) trying to figure this out. Had to jury rig a plug in light for next to my sink.