Dad’s 1969 Dodge Dart Swinger 340

So you can depress switch and brake lights work?
We had a similar issue with Dads 67 cuda, same switch. I could be wrong, but double check hazard switch/wiring. The hazard switch can be connected incorrectly as it's a 4 terminal plug and could be connected 180* out. Hope that makes sense?
Good luck.

Depress the switch to turn OFF brake lights. Switch is normally closed, which means activating it opens it and turns off the brake lights. Regardless, that isnt where the issue is. If I jumper out the switch, the lights should turn on. They dont. So there is an issue someplace else.

Thanks for the tip on the hazard light switch. I will try that tonight!