When you’re installing a non-metallic electrical cable, you must identify the sections of the cable: the outside sheath (the jacket) and the interior conductors. What seems to be colored “wire” is really a sheath that covers the copper wires within.
Many homes that have stucco as an exterior coating have cracking issues, but most of them can be repaired quite easily. There are different kind of cracks that appear and knowing how to go about fixing them is half the battle.