When working on a vehicle, you may have to remove the battery terminals for safety. This is always a good idea when you are working with the fuel system, the ignition system, and the starting system. In many cases with the newer vehicles, if you remove the battery cables, you wipe the computer memory and the vehicle won’t start. To prevent this from happening, purchase a memory saver. It’s a small device that plugs into your cigarette lighter and gives the computer just enough power to keep the information required to start your vehicle.