I have just bought a used Sony Discman player to use in my car because the built-in one started rejecting CDs (older GM/Delco player, as they're wont to do).
It has an adapter that you plug into the car's cassette player, then there's the 12V power adapter for the power. When I plug the power adapter into the power source (my car has a dedicated one, so I don't have to use the cigarette lighter), a little LED light comes on on the power adapter to show it's getting juice.
My question is, would it drain the battery if I left the power adapter in the power source all the time, and the little LED stayed on all the time? It's kind of hard to push it in and I'd like to avoid that every time I want to use the CD player. Also, this is assuming I have the Discman turned off, of course.
I was looking in my car's owner's manual and it says my car is equipped with a feature that automatically turns off the headlamps and any internal lights after 10 min. if you leave them on by mistake, but I wasn't sure if this applied to the 12V power source.
I thought someone out there might have some experience in using external CD or MP3 players in their car.