Aha. Interesting. There is power up to the wires that go up to the actual screen through the wood above the dash. However, I cant see an easy way of getting the leather covered roll off the dash top. Or perhapsmitnis easier to unbolt the screen? I'm a bit scared to do that? Any thoughts.

Indicidentally I'm getting 22v across the supply... I take it there is some sort of voltage doubler to reduce the amps.