1935 storybook cottage
I replaced my bathroom light fixture, wall mount over the mirror. There were several wires that were twisted together in the box and when the wall switch is on, I got 119V. However, when the wall switch was off, I got 18.4V on my Fluke. The wall switch was replaced by an electrician with a GFI switch/outlet combo.
I'm guessing the reason there are 4 wires twisted together is one set used to go to the outlet that was commonly found on porceline bathroom light fixtures. I'm afraid if I try to twist it apart the wires will disentegrate. They're solid enough the way they are, but it looks like someone actually twisted, and then soldered them together.
So, is 18 erroneous volts really a problem? Will bulbs burn out quicker if the constantly receive a small stream of voltage? Is it worth messing with or is there a chance I'll create more problems?