I am looking to install additional monitors in my 04 Mada. How do I hook it up to the factory DVD and factory overhead monitor. I am looking to put monitors in the headrests and have it all integrated in the factory HU.
You will have to splice a set of RCA's onto the factory wiring. Run those to a video amp and then plug in the monitors to the amp. I would look for a amp that gives you more than one input so you can expand when you want more than just DVD.
Look in my how-to thread a couple of post down I have the factory video wiring diagram shown.