hi I have got an old ford conquistador and the wireing loom has been trashed and "modified" somewhat so many things dont work.

any body know where I can get a wire diagram from please

I would check at http://www.alldata.com/ They have good wiring diagrams. Ask about your vehicle. Cost $29.95 per year.
http://www.ebay.com/ Search for a wiring diagram for your vehicle.