My left headlight works but not the right. My right turn signal works only in the
front and left one lights up but doesn't flash but makes a fast clicking noise.
Brake lights work but not the tail lights
I had the same problem and a wire insulation had opened up grounding into the frame... look at tailight wires
The fast clicking noise or rapid blinking is from a bad bulb...
Search Ford Mustang Questions
Ford Mustang Experts