Scooterotica

Hi
ok my set up is an s1 no battery af simplified electronic loom, i have been following the wiring info on the lcgb site so have connected the brown from the loom and the switch into the juntion box along with the purple from the switch ,so my qusestion is how do i get power down to the horn with no spare brown feed ? have the white from the switch but no live .....im taking it i will have to run a spur wire from this but how also.......... i have a grey from the loom that i dont know what to do with appolgies if this is a simple question but i know feck all about wiring

T into the brown on your loom on the steering column to feed the horn. The grey is probably an extra wire that would be fitted to a front brake switch