that was my next thought. there may be some sort of voltage regulator in the plug and you may need to keep it. if thats the case, you can solder onto the contacts and connect them to power and groundCorrect me if I'm wrong, but I know a stereo shop told me once that some devices that are designed to run off a cigaret lighter plug will no longer work if you just clip the wires and feed them power. Could there be some kind of device inside that lighter plug that regulates the current?