Locating and Identifying Wires in Your Vehicle
When looking for a specific wire, a wiring diagram will tell you what to look for and the position in the vehicle where it is located. If your wire is managed in some kind of harness, do not be afraid to open it up if you are having problems identifying it in a bundle. Without doing damage to any of the wires in the bundle, open it up. From there it should be easier to identify your cable.