Why are map lights red?
Why are map lights red? Police officers don't have time to wait for their eyes to adjust to darkness so using a red interior light saves them crucial seconds. It takes around 30 minutes for your eyes to fully adjust to darkness and, for police officers and other emergency responders, that is 30 minutes too long. How do I know if my light bulb socket works? Turn the power off to the socket.Test the socket by attaching the clip of the continuity tester to the hot screw terminal, the black wire lead. Then, touch the probe to the metal tab...