All my bulbs are good and I can't figure out why my left side wont blink. The tailights work but not the brake lights or turn signal on the left.

By the way, I do have sequential taillights and the connections seem to be good.

 

The only reason for the signals to not blink on and F-Body is that one of the bulbs is blown... How do you know all of them are good?

 

I agree with '94 Bad A Z28 that it most likely is a burnt bulb. If the turn signal light turns on and stays on without blinking the culprit is most likely a burnt bulb. Check your front lights as well. A burnt front light will prevent a rear blinker from blinking.

 

I dunno, if the brake lights aren't working either, you may have a short/ground somewhere in your wiring. Before you look into that I would definitely still check for burnt bulb in one of your lights though.

 

Sockets here.For some reason the sockets bite the dust.Have replaced both front,and 2 rear.In the sockets,it seems the black wire(ground)doesn't work after a few years.You can get replacement sockets at Kragen auto parts,or even pep boys for about $6.00.The dealer wanted $55.for each socket.Hope this helps.