Lost horn wire

I rewired my 68 Camaro, again, and installed a newer style alternator, internally regulated. Some how in the process I lost my horn wire.

I've checked all the wires on the bulkhead connector for +12 and ground and can't seem to find one that does something in conjunction with the horn button (I probably missed it).

Does anyone know which wire is the horn signal?

hehe join the club buddy. I did this to my 80 camaro before i had a computer or i would have asked the same question. I just hooked up a knee button under the dash. Kinda oakie but i never use a horn anyway.