I'm not sure about this, but Bluestar Flexible Concrete Crack Filler works best for thin cracks, and Red Devil 0644 Pre-Mixed Concrete Patch works best for large cracks, in my experience.
An electronic stud finder is one of the most useful instruments for finding wires without power. The majority of stud finders are designed to locate wooden studs in walls, although some can also locate wires. A voltage detector is also required to determine whether a wire is active.