I a have a lot of electric testers. I have one that looks like a screwdriver
Using a led bulb. It has a red and black probes. I know how to use it in an outlet.
But what about just a wire, how do you test the wires themselves to see if one of them is hot.
Do you take the probe on the wire and the other probe to ground?? To see if the bulb lights up.
Going to each separate wire.