Ok I did the first test. I got 11.9v on the blue wire. I checked the pins and receivers on both pieces oh the t/s wires. All looks good. Mark
OK...you're getting power to the turn signal switch. Let's turn to the turn signal switch itself. First, disconnect it from the underdash harness and you'll need to set your DVM to resistance, ohms, or the upside down U. No need for the key to power anything. Put the turn signal switch lever in the neutral position and look for resistance between the blue wire and the following: white/blue, green/white, orange/blue, and green/orange. These wires are in the center of the turn signal switch connector, top and bottom row. You should see high resistance between blue and these wires.
Now put your turn signal switch to the down or left side position. Measure resistance again as above, and you should get low resistance for the green/white (front) and green/red (rear) lamp turn signals. High resistance for the other two wires.
Put the turn signal switch to the up or right side position. Resistance should be low between blue and white/blue (front) and orange/blue (rear) wires. High resistance for the other two.
Now then...brake lights come from the green wire below the blue wire. You can measure resistance between the green wire and the four above. You should see high resistance for the white/blue and green/white wires and low resistance for the green/red and orange/blue wires, with the turn signal lever position in the neutral position.
Post the results and I'll bet 67gtasanjose's afternoon chardonnay glass that the turn signal switch is bad.