You have now ruled out earth faults, and many possible indicator faults, if the hazards work. However, the hazards are fed from purple, and the indicators from green, so there is every possibility of the green feed via the fuse being duff.
By full beam headlights, do you mean main (lever down away from you, as opposed to dip, lever up) or flash (which works with everything off, lever pulled up against spring)? Flash is again fed from the purple, but if it works it proves continuity of the main beam circuit, but not the brown feed to the light switch, or the blue from there to the dip.
I think the areas of concern are getting smaller. If you can prove, or disprove, that there is 12V on the brown wire at the light switch, one fault is close to being pinned down. Then if there is 12V on the green circuit, only with ignition on of course, we can get a bit closer to the other one.
Yeah basically I can flash my headlights and leave them on the full beam but I cant physically turn my lights on with the switch on the switch panel, all the wires behind there are still connected too so it must be somewhere in the engine bay
