This job has changed slightly. The symptom I posted above didn’t make sense. I couldn’t see how a side light fuse blowing could be connected to the jeep loosing all its lights. That’s the main reason I wanted a diagram for it.
Having spoken to him again, it turns out that on a long journey he tired of changing the side light fuse and put a bigger one in which resulted in the fusible link blowing and the loss of all the lights.
So its just a side light circuit fault, wont happen for me, and I cant see anything wrong except all the bulb holders are corroded. I am just going to fit all new bulb holders and bulbs, seal up the lamps and let it off.

Thanks for all the suggestions.