Driver Side Hazard Flashing When Off 1974 Plymouth Valiant Scamp

Update. After much messing with wiring harnesses, sockets and checking grounds, I pulled out the recently replaced Chinese turn signal switch and my multimeter showed some low resistance between connections that should be open. I've messed around bending pins and checking connectors and it seems to be working right, but I'm not installing it in the car. I'm sourcing a quality part.