Just bought a '90 XJ. All my turn signal and flashers work with the exception of the front right. Parking light comes on, but no blinky. Swapped the socket as that seems to be a common problem, no change. I'm under the assumption that it can't be a fuse or flasher since all 4 corners run on one circuit, correct?

I have checked the blade connector under the dash and everything is plugged in and corrosion free. Also checked the 10 pin behind the front left headlight. It was corroded pretty badly, but I cleaned it up and reconnected and still nothing. I would assume it is a broken wire, but I can't find a good diagram that will help me trace that wire all the way from the bulb to the switch.

Any help?

 

Check your ground for that socket.

 

Knew ground was good since the parking lamp lit.

Fixed it. Traced from the socket to the 10 pin, no continuity on the blinker hot wire. Pulled the grill and checked the wiring harness. Lo and behold, about 2 inches further back from where I swapped the socket, hiding in electrical tape, was a previous "repair" that consisted of wires stripped and twisted together. Hot wire for the blinker had come loose. Put on a proper splice and we are all good now. Knew it had to be a wiring issue, just didn't know where to start.