12v pos/neg earth

To make an adapter you will need one each of the cigar lighter plug and socket. Here is an example:

http://www.mcmelectronics.com/product/27-610

http://www.mcmelectronics.com/product/27-825

Connect them together with a pair of wires but reverse the wires at one end. That is, connect the center terminal of the plug to the side terminal of the socket and vice versa.

Peter,

I think I understand - but if you could email pics or even a wiring diagram (I am a bit "electrically-challenged" hahaha...), that would be great. Email me at George.parker2012comcast.net. Thanks!

George P.

I installed a seperate cigarette lighter socket and ran the ground to the center pin of the socket
and the inner metal shell body connection to the hot (-12v) supply.
The outer body and mounting of the lighter socket need to be plastic and the connection from the hot (-12v) must be fused at 5 amp or so. Use an in line fuse assembly for this.
I use this for cell phone charging and to power a car radio I installed as well. No static issues, Of course the antenna must have a floating ground return as well.
Be glad to send you photos by email if this is confusing to you.
Regards
Pete Pifer

Your XK140 will not care but your cell phone surely will. The socket leads need to be reversed --then you need to mark the plug so that you do not use it in a negative earth car.