need help hot wiring brake/turn lights

If you have the stuff under the dash "factory" that's what you need. The rear harness connects in the left kick panel. Tail goes throu there

Brake switch goes INTO the turn signal switch. Left and right REAR turn wires come OUT of the TS switch, go to the kick panel connector, and then back to the lights

In other words if the harness is intact, the trouble is inside the car, not in the engine bay