I would still say a dodgy earth, get yourself a simple bulb style circuit tester and look to see what is live and isn’t when you turn stuff on/off and unplug things. Sorry all you can do is logically go through it until you find the problem.

Had an issue with my brothers 90, front indicator making headlight flash. Turned out to be an earth on the rear light unit on the opposite side of the vehicle.
 
Have you measured the resistance from the earth point to the negative on the battery? It should be a very low resistance.
 
I found that steel bolts work much better for earths. That looks like a stainless bolt thus I'm inclined to suggest you change it for a steel bolt and see, having sanded the body work which it contacts first.

I had a similar problem and I was using titanium bolts, because i had a load of them, and they are more or less insulators! So I looked into it and found the above information to be true. Having used steel bolts I sorted the problem.

Despite your efforts, it does sound to me like an bad earth that you haven't rectified yet!
 
Mackers said:
I know everyone's said earth. I done em all and there's nowt wrong with the earths.
Click to expand...
Doubt you’ve done all of them over the entire vehicle yet. And they can take some checking, as things may appear ok at first only to be an issue when another circuit is powered.

I recall a number of years back my Grandads Rover 600 had an earthing fault. When you pressed the brake pedal the headlights came on!
 
Faulty earth on the body connecting to the chassis underneath. What a palaver it's been. I'd hate to be an autoelectrician. A frustrating process of elimination. Y'all were right. Well done x
 
Mackers said:
Faulty earth on the body connecting to the chassis underneath. What a palaver it's been. I'd hate to be an autoelectrician. A frustrating process of elimination. Y'all were right. Well done x
Click to expand...
It's the easiest job in the world being an auto electrician on a landy. It's always a fuse or bad earth.
 
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