Ok, the brake switch is midway in the circuit, so lets start there and see which way we need to go.
The pink wire with a dark blue tracer should have 12 volts on it all the time.
With the connector plugged into the switch, probe the backside of the connector and tell me if you have 12 volts on the white/tan wire with the brake pdeal depressed.
One other question.....does the high mounted......or third brake light work?
So I can come back to this later like tomorrow? I can't run the volt test right now, The third light and mounting was removed years ago to fit the spare tire
Ok, good. So the brake light switch is working.
From the brake light switch, the wire goes to the multi-function switch on the steering column.......this is your turn signal switch. You will need to test the wire at the switch to see if you power in and out of the switch.
Test the white/tan wire at the switch to see if the power is going in and then test the dark green/red and brown/red wires to see if the power is coming out of the switch.