Outer Limits 4x4 Board

g'day need to wire up a horn by the morning the old wireing is not working can i wire it to a switch or something to get working temporarely and how to do it , till i can connect up properly just need to get working urgently thanks in advance any help appreciated its in a toyota hilux 86 single

one side of your steering wheel pad is ground find the other end put that into a relay coil with +12v on the other side then feed 12v into one side of the relay contacts and the horn on the other. the horn will be grounded through the body of the horn.