1966 dart convertible

New harness' from headlights to taillights, everything is hooked up/ grounded. Running a charger at 10 amps for power. Have relays installed in the headlights and convertible top. Here's what's not working. Parking lights, turn signals, stop light and when I turn on the left blinker, the horn goes off? Lol. All circuits seen to run back to the turn signal switch. So, what do you think? New t s switch? How would one test it?
Any help is appreciated.