Instead of cutting and splicing at the device end, you cut the old connector off, strip the wires, and crimp/solder the pigtail's wires to the vehicle's wires. How it works in vehicle cables: Provides a secure, insulated connection. A pigtail in electrical wiring is a short length of conductor used to transition from a bundle of multiple circuit wires to a single termination point, such as a device terminal or fixture connection. These short wire segments solve space constraints in junction boxes by creating a central hub. It is used to join electrical components quickly and reliably. You can continue this daisy-chaining of shield grounds to a single pigtail wire for as many. A corroded or broken connector can disable a sensor, overheat a circuit, drain the battery, or force replacement of an otherwise serviceable wiring harness.
[pdf]