Lighting problem / Electrics expert required!

[StuartGSXR]

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

Good thought, although I am thinking the wiring must have power up to the 4 pin relay as I unplugged the relay and looped the 2 power connectors in the block and the headlights came on.
Unfazed was the one who came up with the relays advice in the other threads I found via google so will defo have a look at the switch as well.