Help-Advice Needed Re Wiring Diagram

I need to wire up my 4WD vehicle for towing a caravan and was wondering how to go about it when I came across a 4WD in my travels with a towing plug/s setup that looked just the ducks guts for my requirements.

I waited awhile for the owner to return to find out what 'secret stuff' they had used etc etc, however they didn't return by the time I had to leave , so I took a picture of it for future reference..



Problem now is that I can't make head nor tail of whats what and where all the wires go.

Is there somewhere I can get a wiring diagram for this setup, or perhaps someone can advise on it.

Thanks in advance

DD
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