When I bought my truck it had a different horn button (2 wire) in it but no horn. I finally figured it out by trial and error :confused:
Lets see if this works.
From the horn button there are two wires.
One is grounded in the cab.
The other goes through the fire wall and is
spliced w/ the black wire that runs from the
horn relay to the engine harness (the one
where the lights hook up, that eventually
hooks to the fuse box). That group
of wires runs to one of the terminals on
the horn.
The other green wire from the relay goes to the horn.
Oh, I guess that depends if the 56 is the same. :o
Sorry if I might have made you more confused
