Hi,

I just changed my light fixture in the hallway next to the bathroom. Hallway light fixture works fine but bathroom light won't turn on? Bathroom light switch is a single pole switch.Hallway ceiling fixture is connected black/red white/white and black wire is capped off. I have 2 white wires and black wires coming from the bathroom and have no clue how or what to connect them too.

I don't follow your description very well. Do you mean you that at the hallway ceiling you have a 3-conductor cable with black, red and white wires and two 2-conductor cables each with a black and a white wire?

First, I would expect to find at least 3 cables coming into the hallway fixture. Is the hallway light controlled by two switches (one on each end of the hall)?

If so, that explains the one cable with three conductors (Black, White and Red with a bare ground) This is the cable that connects the feed cable to the two switches.

If that is true, then what I would expect to find is a main feed cable (possibly a two wire) The black on the supply should connect to the black feeding the switch cable and the black feeding the bathroom light.

Red and white in the 3 switch cable are what is called "travelers". They control the behavior of the two switches. Red and white connect the two hallway switches with the to the light. The return from one of those switches will connect to the light fixture.

The feed to the bathroom light would connect to the feeder supply at the feeder black. All of the neutrals (white) for the power cables will connect at the main feeder.

The white being used as a traveler between the switches does not connect to anything but the other switch. It is no longer a neutral conductor and in fact should be either marked with tape or marker in red or black to show that it is hot conductor.

At the bathroom, the white conductor from the switch should connect to the black supply wire. Again, this conductor should be marked to show that it is hot conductor and not a neutral. The black from the switch (return) would connect to the black at the light fixture. Again the actual neutral wires would connect together.

Clear as mud?

Now I would also expect to see the