no electrical supply going to the horn,

[briski37]

all fuses working , all electrics on the chim work perfectly except horn, anyone had a similiar problem, grateful for any ideas,

[david beer]

With your ear in the fuse box area, press the horn button to see if you can hear the horn relay click. If not the problem lies from there back to the button, if it does, its from there to the horns. There is the small chance its the relay, but you can swap that with another relay. Hope that helps.