If you're talking about the pigtail between the GPR and the VC connector, just a continuity test would do it. These are used extensively to create connections in various electrical systems, acting as an extension or bridge between two points. Their compactness and flexibility make them ideal for. The frame has high magnetic properties and, together with the pole pieces, forms the major part of the magnetic circuit. ) (The frequency of the alternator voltage depends upon the speed of rotation of the rotor and the number of poles. We'll show you why professionals consider this technique. I just installed my CTEK 4. When the car is running the indicator is green. Mine is green while. Short answer: An automotive wiring pigtail is a short section of wire with a pre-attached connector that lets you repair or replace a damaged plug without replacing the entire harness.