I'll look up where that pin 3 supply is coming from in a sec, just need to finish making a cuppa.

I'm confused by that, pin 3 seems to go to the right dipped beam headlight bulb, so shouldn't connect to batt positive?

What range is that meter on, in the pic where you're on pin 6, and is the probe definitely getting in there properly, and where's t'other probe?

If it was me, I'd run in a new wire from the cut stub of the one coming out of pin 6, all the way to near the fuse and splice into the existing wire there too.

Ok, all faults now clear down after running live feed to pin 6 so it is a break in the engine bay somewhere!

 

Just need to find somewhere neat to tie this in to now……

Can't you just run that wire along the existing loom, out through/near the grommet that takes the loom out of the scuttle into the bay near the ECU, and splice into the fuse wire after following the loom from there? May be hard to do super-neatly, but I'm not that fussy. 😁

I did exactly that! I resoldered it back into fuse 10 and tied it in as neatly as I could. No faults anymore. Thanks for your amazing help on this one!

Great work guys!