What light bulbs does the Prius use?
Why does my iPod hum when played through the stereo? A: The most likely problem is ground loop feedback. Quick way to check: Play the iPod through the stereo (with a 1/8″ terminated stereo cable) and just use the iPod’s internal battery for power. Next try to power the iPod with a 12V power adapter plugged into the car. If the hum only happens when powered by the car, then you have a ground-loop situation. The solution is to purchase a ground loop isolator like this one from Radio Shack… or this more appropriate one from Crutchfield ….or to just play the iPod from its own battery.
