Wiring harness replacement
You guys really fried my brain, LOL Have you got power to the main flasher? To the column TS switch? Wiggle the 'eck out of the connector and check it
If you have power there, if you have hazards, have tried flashers, and have both brake lights, I'd be pulling the lamps apart and check lamp grounds, pigtails and bulbs
You should have THREE power sources coming to the TS switch depending
D32 coming in on a no 18 Pink is hot all the time, if the hazard flasher has power and is installed
D4 coming in on no 18 White is hot when brake pedal is pressed
D2 coming in on no 18 Red is hot anytime key is "on" with a good flasher installed. This is power coming from the TS flasher