The best pigtail for your needs depends on whether you're working with copper wiring or fiber optics, and selecting the right type—such as SC, LC, or ST for fiber, or insulated vs. uninsulated for electrical—ensures reliable performance 1. These connectors can be a big help when you need to connect two wires, repair damage, or extend a. At FindPigtails. That's why we've compiled a list of our top 10 most in-demand automotive connectors to help you quickly find the exact part you need. People often make this connection in the field, where they must make temporary repairs or. A pigtail connector is a short length of wire with a factory-terminated connector on one end and bare, exposed wires on the other.