Can one of you knowledgeable gentlemen tell me which is "Positive" & Which is the "Negative" wire ? I am putting a cigarette type lighter/socket so my lad can plug his gismos into along side his seat in the back rather than run extensions from the front cigarette/cigar lighter all the way back.. I have taken one of the interior lights down above his seat and in between the cupboard floor and to where the light is fixed it is double skinned following the quite thick wire into this skin it leads to a sort of junction which in turn all the interior lights on this half of the RV go to,, and the wire is very very thick so I should be able to take off from these junctions to my new socket,, Now the wire to one junction is white and to the 2nd junction is green... but from the white junction goes a white wire to the light casing and from the green junction a black wire goes to the centre pin of the interior light.. Which colour is likely to be "Positive" and which "Negative" I dont want to get it wrong as I believe it could blow his DVD player etc.oh: Sorry this is a bit long winded but awkward to explain.. Thanks..