If I turn the key on but not start the engine, and turn the radio on and a turn signal, the clock light on the radio goes almost completely off and back on with each blink of the signal. Also cuts the radio sound out for a second or two on the first blink of signal, and then just the clock flashes on and off. This happens with no headlights on or anything else. Just key on, radio and a turn signal. So it isn't the idle speed. Thank you.