I confirmed the horn button and the relay work so I went to look at the horn itself and turns out my car didnt have either horns, nor does it have the wires to the horn. Where should I look to find any kind of horn wiring so I can fix the rest of it?
Also I have a scrap 89 firebird that had a horn button installed on the dash so I pulled that wiring and put it in the 87, connecting the white wire as seen in the picture to the “B” port in the fusebox, as it was on the 89. And it didnt work, why?

I don’t really know electrical stuff sorry if this is a stupid question. This horn button worked fine on the 89 right before pulling it.