Have a 6.5 inch boss screen wired up to my jvc dvd deck sometimes it stays clear but when to many power sources such as my ac and lights are running the screen cuts in and out i tried wiring it up direct to the battery with a fuse same problem and recommendations or should i go out and get a video signal amplifier. The guy here at the car audio shop told my you usually only use one of those amplifiers if your running 2 or more screens????