Lighting problem / Electrics expert required!

[His Dudeness]

That signaling system fuse gives power to the horn, the brake lights and the light switch which give power to the control side of the four pin relay so it's worth checking. I'd check that the fuse is nice and tight and has good clean contact. It's an easy thing to check and rule out anyway or just go straight for unfazed suggestion since he's right 99% of the time :lol  The wiring diagram is at the end of that manual http://foc-u.co.uk/index.php?action=down...iew;down=5