Does anybody have a wiring diagram for the lighting system on a sportrak?

I have a J reg ELXi which has been 'modified' a previous owner. At the moment I have a voltage at the bumper n/s indicator, but can't get the bulb to work in it - no current?. Similarly the rear side lights on the side units don't work. When examining the n/s bumper unit, a fairly flimsy 'extra' box was attached, of which one of the pins had corroded. I've replaced this, but can't get the indicator to work (although the the side light flashes when connected to the indicator wires). A wiring diagram showing the original set-up would help enormously.

Also, does anyone know if the pins in the hinges are threaded - my top pin isn't holding the door and I need to remove and replace it?

PS got power to the cigarette lighter - thanks for your advice everyone - but the element isn't working!

Still shutting the windows for a light,
Bort