Hi All,

not posted for a while, road car giving grief, another story, anyway took kit for mot today, failed on horn not working, and emisions, did not take my sva paperwork to prove test spec, have checked horn on bench all ok, reconnected to kit, can hear relay clicking, have checked wiring, all ok to sierra drgs, any other checks I can do before buying new relay from fords etc, thanks

Andy

not 100% with car looms but bikes have a live feed to the horn and the switch is the earth

just rewire it

two ways...
take a cable from your ignition switched live to your horn button
from the horn button to the +ve on the horn
from the -ve on the horn to earth

or
cable from switched live to +ve on horn
from -ve on horn to horn button
from horn button to earth

you dont need a relay for it, mine works fine without anyway

probably bad earth?