when you flip your blinker on, a relay in the circuit is activated which turns the light on and off.
also, the front blinker and rear blinker usually alternate in turning off and on, so when the back is on, the front will be off, and reverse.. that's why when a bulb is out, the clicking sound in the vehicle goes faster than when both are in working order.
The tail lights are on a separate wiring than the blinker/brake lights. Look for a blown fuse or a broken/loose wire.
whats the color circuit for the blinkers an break lights?
change the bulb out for the brake light and that fixes the problem.
i don't know if it is a Ford thing, but my dodge did somewhat the same thing... my blinker would flash very fast on the dash and it turned out that my bulbs were out in the rear (maybe that is the problem and your brake lights are connected). When the bulbs burn out the circuit is shorted.
Problem most likely is in the Turn Signal switch. I had same problem , replaced Turn Signal switch assembly and that fixed it.
Check the switch
First check the fuse, or you may have a burnt out bulb
How about a malfunctioning brake light switch
check the brakelight switch. it is located under the dash where the brake pedal rests. Hey its ritchie. If you can click your blinker down and then they work its you blinker switch,but this is my monte.
Check the ground wire to the brake lights.
the blinker switch shorted out the brake lights... really really common problem, need to replace the switch
The next thing to check is the switch that activates the brake lights. It is probably on the master cylinder.