1967 Dart horn circuit uses a relay. When horn ring is depressed relay signal circuit (black wire) is grounded activating the horn relay mounted adjacent to the horns at passenger’s end of front upper cross member; look for violet conductor feed from alternator to relay and green conductor w/red tracer from relay to horns).
To run two horns, just splice a jumper on hot lead (green w/r) on first horn, and connect to second horn.
I’ll attach a photo later of my duel horn setup once my camera gets recharged.
Camera is working, honeydo's completed, SSS long completed, as promised images of horn placement, and conductor layout:
I substituted a blue conductor for factory violet to power horn from alternator, black signal wire from horn rim is wire tied to blue conductor; both terminate at horn relay:
Hard to see top horn feed by green conductor from relay, and has jumper from it to feed to lower horn. Bolting horn to body of car provides ground to circuit:
Schematic look here in upper right next to battery for horn relay.
