12n tow bar wiring

i've just bought a tow bar from a local breakers and i need to wire in the second plug (12 n) can anyone help with any wiring diagrams.i've got a plug digram but it doesn't tell me where to run the wires to get the power can anyone help?

Good luck getting a reply I've asked the same question a couple of times but not had a response.

Here is a link to a post in the 'Towing' section of the forum, with info about how I wired my C70.

Very good forum it is too :car-smiley-003: Thanks for the response.