Important to check for polarity. This means is it + or - at the tip of the plug. Oh and check that the lcd is DC, which it will be if it runs direrct off your car/caravan elec.
Somewhere near the power socet or on the data label should be some symbols probably where it says 12v. Should look a bit like --C.-+ only the first - will be in a circle. The full stop after the C, will be a big dot inside the capital C, and the + at the end will be in a circle. If its that way round, its positive tip. If the symbols are reversed, ie after the big C whith the dot in it its a -, its negative tip.
I know this sounds confusing but it isnt. All that matters is what is the symbol in front of the big C. make sure the transformer you buy has the same and you will be ok. If your stuck I can post U one. Albiet old.- a geez in need, is a geez in need of a deed. After all, a pigme i suppose, is sorta like a dwarf!
Dear Ed, I agree phone trannies are totaly unlikley to be anything like 3Amp. And certianly not mobile ones! But 12v, yes there used to be plenty of them about (likeley car boot material) for example my Panasonic KXT2429 in its day the most popular tele/anaphone ever sold in the USA/Canada.
Whith huge world wide sales including europe and in the uk. Both as Panasonic and badged as the BT king Fisher KXT2429BE -The phone people used to buy just to get the tone dialer accesory so they could blag callboxes to do free overseas calls.
There were a number of other phones around that also ran on 12v albiet a few years ago. I think, although I could be wildly wrong, my KXT draws 0.9Amps.
I have a Texas Instruments/Toshiba lap top AC adapter ZVC36-13-E52569, 50-60hz,100-240v/13v, 2.77Amp,0.6-0.3amp, 36watts continious rated, positive tip, about 1995 vintage. I agree these days 12v lap tops are probably a bye gone, but what is likeley to turn up at a car boot? My new lap top runs 19.5v, 4.62Amps. I am sure you can find every flavour in between and more. Cos their 4 lap tops they tend to be very stable.