When I did my 1198 rad (hole) I accidentally displaced the horn wire and the fan grazed it and shorted it. Blowing the fuse etc.
The horn wire had gone out of the harness, so wired it direct to the battery with an electrickery unit: ended up mounting it here as it was easier and cool enough for the plaggy unit
Same place as the mode switch: https://www.bikesportdevelopments.co.uk/ProductDetails.asp?ProductCode=BD_SW_2B_02 Pricey for a horn button, but I had to have it, no other button would have done (they would have put 'horn' on it but that's pants)
You could have got a cheapo one like this just for the horn: https://www.ebay.co.uk/itm/Motorcyc...739245?hash=item4b3a3ec46d:g:FsgAAOSwuQxacoUo
Q. ? On your 'MODE' switch, the writing runs vertically to read... M O D E By the same logic, your 'PIT' / 'HORN' button says... Is that Яussian?
It's for left handed pit entries when banked over - there's another on the right hand side or... The button should be mounted downwards but for easier reach as a horn I have done otherwise