130 Tow Bar Wiring Diagrams

A local rescue charity up by me has a Defender 130 and a friend of mine who does voluntary work there has said that they need a wiring diagram for this vehicle. It's a 1998 R Reg Defender 130.

They need a tow bar wiring diagram of the entire wiring diagram. Does anyone know where i can get one for them for little or no cost?
Regards
David.

Somebody posted the address of a website that has the workshop manuals on it, but I can't find it now, can't remember who posted it either. I'll keep on looking.

Found it.

http://www.landrover.ee/est/varia/downloads/cars.htm