No, the cables are probably fine; you just need to clean the corrosion off. A battery-terminal cleaning tool and a small wire brush come in handy for the job. If you donâ€™t want to have to reset all your radio presets and the clock and so forth, get a memory saver that plugs into your cigarette lighter to keep things powered up while the battery is disconnected. Be careful while you work around the battery not to touch both terminals at once and donâ€™t let any tool or metal object touch both terminals at once. First, disconnect the cable from the negative battery terminal. Then undo the positive cable. Clean the cable terminals on the outside with the wire brush (wear some safety goggles while you do this), and twist the tapered cleaner tool into the terminals. Clean the battery posts with the terminal tool, and replace the positive terminal on the battery. Replace the cables.