afternoon peep's.

i need abit of help with some wiring on my old man's van... we're tryin to fit a tow bar on the back so i can tow a trailer to pick up my new car on friday, but we need a diagram of the rear light's wiring so we can connect the plug thing for the trailer...
does anyone have a diagram atall please? here's a pic of the model transit it is...

it's a 'W' reg transit 190 (smilely face model)
any help would be great!!