I'm trying to troubleshoot some electrical issues myself before I hire an Electrician. Partly out of curiosity about what the #$@%! the previous owners of the house did, but also hopefully to save the Electrician a few hours, and myself a few $$$ :)
Multimeter usage - Am I doing this correctly? When I attach the black probe of the multimeter to the ground in a 3-wire cable, and touch the red probe to the other wires in the SAME cable, I get these voltages: black 30V, red ~6v, white ~6v. But, when I attach the black probe to a completely SEPARATE ground (like from an extension cord coming from a completely different circuit on the other side of the house), I get: black 120v, red 0v, white 0v -- which was closer to what I was expecting. Are you not supposed to use a ground in the same 3-wire cable when testing with a multimeter? Does this mean there's something wrong in the cable??