06 lincoln navi ceiling mounted dvd

dad has stock ceiling mounted dvd player in truck. he is wanting to change it as its to small for him... does anyone have any suggestions on how to remove and wiring cause i was trying to remove it but had a problem...also any suggestions on wiring.. any advice would be great as this is a late fathers day gift

Does it have Panasonic written on the face of it anywhere?  If so, did you remove the visible screws? 

Once unit is removed/unplugged using a multimeter you should be able to probe for the constant (12v) with vehicle off, next find the switched wire (acc)with vehicle on, then if optioned the dome light trigger switch, probing each wire with doors closed then open drivers door to see a 12v+/- change, the unit you are going to use may have a polarity switch for the dome trigger, if not you will add a relay if needed on a negative switch, all of these wires should be located in the original harness, good luck.Chadillac

ok i ended up installing it jus tagged wires to dome light and finished install...but pops didnt want me to have holes in roof liner for bracket..so i made the adjustments to get it up there... then he messed up not knowing how to switch ac in rear from top to floor and blamed me and made me remove it when all it was..was that he didnt know about the controls in overhead up front...but hey gotta love pops LMAO...thanks to all who replied