fitted the wheel 2 my gt but cant get the horn 2 work the boss kit has 1 black wire coming from it what bout the +?? n e 1 fitted 1 b4?

the +12v is the black wire and it grounds directly into the car *i think*

the black one is live, i had to drill a hole in the boss and attach another wire to the horn for earth. i think you can get a omp horn push that only needs the single live feed though.

Thought i had exactly the same problem, but it turns out it was just the metal tab connector under the wheel boss which is part of the steering column. Just needs pulling and bending out a bit further so it makes a connection with metal of the wheel boss. Take the wheel and boss off and you should see it, brass/bronzey colour strip of of metal.

The black wire is the +ve and should connect to a tab on the back of the horn push, the horn push should ground itself on the wheel boss which is in turn grounded on the steering column. Hope that helps rob.