the horn button energizes the horn by supplying ground to one side of
the horn.
If you use the same wire to supply ground to a relay to energize it,
such that when energizedthe relay will supply 12 v to one side of the
horn, ( where ground 'was' ) and connect the other side of the horn to
grnd ,
itshould work perfectly.

On 9/21/2013 2:37 PM, Gene P wrote:
> So it had been over two months since I replaced power steering rack,
> pump, hoses, alternator with wire harness, and all front suspension
> bushings.  Sometimes brutal but successful work.  So today I thought I'd
> do something easy, just cuz, like throw in a horn relay.
>
> Result -- no sound on pressing horn ring, very faint tone on releasing
> ring. ???  Pulled wires, tested 12 volts on yellow/black. Replaced
> wires from ring directly to horn, eliminating today's relay work. Horn
> acts the same, just the slight tone on releasing horn ring.
>
> Horn was fine before I started this silliness, so how did I kill it?  Or
> is there something else to do before just buying a new horn?
>
> Thanks folks,
> gp
>