Connect the pigtail wire to the electrical outlet or end device by tightening it with a screw. But you have to loop the bare wire around the screw terminal first. Some of these connections require soldering or crimping, so apply the appropriate action. It's a small detail with a big impact on your electrical setup. This guide provides a. Pigtails act as bridges, allowing you to connect several wires to a single point without overloading connections. The good news is that pigtail connectors work for automotive, home electrical, and furnishings projects! Ideally, they are the perfect remedy against faulty or damaged wire connections or broken joints and are much more practical where interruptions or electrical defaults occur. They restore. Is it helpful or does it hurt anything to just add the pigtail ground wire with grounding screw to metal box (screw that grounding screw into box) and then connect the ground wire to the grounding screw on light switch? And is the answer the same if it's a receptacle? The BX should be ground.