If your car does not start, but the radio and lights work, there could be issues with the starter solenoid. The current passes through the coil when the electromagnet in the starter receives power from the battery. It affects the solenoid as a magnetic field is created. If the starter solenoid is not working, you won't hear a click. No power will be generated. But if the battery is charged, the electrical connection might still allow the lights and radio to turn on.