I've recently moved into a new house, and the workshop has what looks like power run to it. There's a cable that goes from the breaker to the workshop, but it does not have power. I assume there's a break in one of the lines in the cable somewhere as I've inspected all of the connections.
The run is through a drop ceiling, which should be easy, but the entire basement was studio insulated and so I can't find this wire. It looks like it enters a bundle with two other wires, but I don't know how tightly they're held together. My guess is the previous owner did the work, and not a certified electrician.
My first thought is to pull the old wire out of the outlet, solder as in-line as possible to a new wire, then shrink wrap that whole thing, and pull it through from the workshop to the panel (would direction matter here for burrs on the holes in the joists, etc?)
What's the standard way of doing this? I'm trying to avoid pulling all the insulation if possible.