ОтветыChanging Car Battery Cables / Kill Switch InstallNo. Here's why. Jumper cable wire isn't usually the same as wiring harness cable. The former is often copper coated aluminum (CCA) wire, while a harness cable is usually pure copper. Test your jumper cable by scraping at the copper: if you find a different colour below, it is CCA or something similar. Do not use this as a splice in your battery harness even if both cables are the same gauge. This is because copper and CCA do not conduct electricity in identical fashions. Moreover, if you were to splice a CCA jumper cable into your harness you would be introducing aluminum wiring, a big no no as it may start a fire. You are much better off simply buying a pre-made cable to solve your problem or have one made up for you. I get mine from del city where they start at about $4 but there are other places that will do it for you as well. You can also buy matching cable by the foot. You can also buy battery splice cables, which are a connector connected to a terminal, about 6 inches long. I use these when I want to c...