Uhm, I never said I installed new lights? The lights are the same as they always were and I never had any problems with the factory navigation unit. I installed this screen quite far back and just haven't gotten around to tackling the problem. As I mostly drive in the city I don't need the high beams that often. It's not a Lilliput, it's something else that I can't remember. It's 8" 4:3:
I'll try to power it directly from the battery and see if there's an improvment.
"Lose power in it"??? The cap?
But that's a few that have suggested a cap for the monitor (if not powering from the battery - ie, a bigger cap).
It may only require a small cap - ie, it may be noise rather than a (dip or) spike causing the problem.
Or try a series choke (as used for radio supplies etc).