My basement was recently wired. Some of the light fixtures only have white wires, nut no black wire. I want to connect new light fixtures that have white and black wire in it, and so am confused where to connect the black wire to ?
I would think, most likely, the installer ran out of black wire strangely enough. In which case he should of put black tape on whichever wire was hot.
You can figure out which is the hot wire (which fyi should usually be black in color) by taking a voltmeter and measuring between one of the whites and the ground wire.
You should get no voltage or very little when measuring neutral to ground.
But you should get 120v when measuring hot to ground. So whichever of the white wires gives you 120v when measuring it against the ground is your hot wire.
Get some black tape, and put a little onto that wire to signify that its the hot, and then attach your light with the black wire going to this wire, and the white wire to the leftover white wire in the box.
The light fixtures are probably using lamp cordage internal to the lamp. This stuff is often "all the same color".
Neutral is the ribbed side. Look at the sides of the wire, one will be smooth, one will have a bump or ridges. The ridged one is neutral. The smooth one is hot, mark it with some black electrical tape.