Turn signal not working

I have a 2003 S10 with about 29k miles on it. The right rear turn signal has gone out (wont flash). But the bulb is good. The fuses are all good and the flasher is good.I swapped the bulb with a new one and nothing happened. Also switched the old bulb to the left side and it was still good. The socket to the right rear is not getting any juice and I cant find the problem.I cant detect any moisture. There is no visible corrosion and no breaks in the wiring that I can find. The indicator in the dash flashes really fast as if a bulb were out but again, not the problem.I dont know where to look next and was hoping someone else may have the answwer. Thank you!