you mean the horn wont turn off
what moped are you talking about
it helps us alot if we get lots of info
check the horn switch, if you take the light/horn switch off the handle bars does it turn the horn off?, if so put ssome electrical tape under the switch so the solder does not ground itself to the metel bars
try checking the wire connector at the right side of the ped(view when sitting on ped)
like i sed we need more info to help.