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If the wiring for the horns are the same as the standard Mustang, the horns are daisy-chained; i.e. the left most horn has 2 wires going to the female spade lead. The ground for the horns is the chassis itself.
thank you Midlife- Yes, I believe the horn jumpers are the same as a 67 Mustang and if I understand you correctly the left most horn being the passenger side horn should have two wires? I will guess that the short cut wire I described below is the second wire you referenced.