Also try to touch around metal parts on the car while the car is on. BUT BE CAREFUL. IT IS POSSIBLE THAT ELECTRICITY WILL SHOCK YOU. If you are waring any kind of pace maker or any other electronic device, or you have weak heart or you are afraid and un-secure, DON'T do it. If it shocks you it means that some wire is touching metal and creating short-circuit that can mess you car, light and everything else.