Thanks PaulD. That was it! As you might have guessed, I am totally new to wiring audio. There is still a tiny whine when I disconnect the other, but that is no doubt because in my mind, I thought more grounding was better and grounded to about everything metal I could find! I'm working on making a switch so that I can manually break the connection of either the stereo or DVD player without having to plug and unplug units. I may also purchase a ground loop breaker just to try to get rid of the last of the whine. Thanks for taking the time to write. Now I can watch movies as I camp in my car. Got S-video, VGA, and RCA video outputs so I'm set.