No brake lights when turn signal is on

Offhand I'd say "the crushed harness" is the no 1 suspect. You should be able to access the TS connector and check right there and or at the kick panel connector and justify every circuit in the switch. Just look up in the diagram and get your colors, what you have is........

With the hazard switch on, (separate switch on those cars) that ties both fronts to the brake switch line, and feeds hazard flasher power in. So the hazards switch is 4 terminals, none are connected when off, and all 4 are connected when on.

At the TS switch connector, you have

flasher power "going in" to the switch

Brake light switch power "going in" with the pedal depressed.

Coming out is:

right front

left front

left rear and right rear are interconnected to the brake light switch WHEN CENTERED

left rear is connected to flasher when in left turn, and right rear still connects with brake light switch

Opposite of above is true when TS switch is moved to right turn.