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More likely that the turn signal switch assembly is bad.Have someone watch the tailights(or use a large mirror) to see if the bright tailight filaments come on with the brake pedal held down while you wiggle the hazard light switch.
The turn signal switch in the steering column has a short in some models. Have someone watch your brake lights and move the 4 way flasher on top of the column from left to right without deploying the switch for the 4 ways. If your brake lights flash ,the harness needs to be replaced if they are still available. Harness around 300.00 plus labor.
Try wiggling the hazard light switch while pressing on the brakes.The taillights are connected to the turn signal switch before it goes to the brake switch.The contacts on the hazard switch are probably dirty(I remember this problem years ago,same symptoms-3rd light works but l/R tailights not working).You may just be able to turn the hazards on+off a bunch of times to clean the contacts instead of replacing the switch.
Yes. But do you have seperate yellow turn signal lights in the rear or do the turn signals work independant of the brake lights? If yes then you need to wire in a taillight converter. It takes your seperate left & right turn signals combines them with your brake lights on 2 wires instead of 3 leaving you with your normal 4 wires in total instead of 5. 1 Left turn & brake light. 1 Right turn & brake. 1 Taillight. 1 Ground. = 4 wires in total. If you dont have seperate rear turn signals just find left turn wire in taillight assembly, Right turn wire & Taillight & a good ground & you are done. On trailer plug yellow is left, green is right ,brown is tailight & white is ground.
your wiring may have gotten pinched by crossmember or something else.i would check for power out of the fuse block.there are four wires on the right side coming out of your fuse box with a seperate flat vertical plug,the colors are brown,dark green,yellow and light green.brown is tailight,light green for your backup lights and green and yellow for left and right stoplight/turn signals.use a test light at the plug.
If all of the wiring, fuses, bulbs, and switches are good (which is what it seems since everything else works fine including the turn signals on the passenger taillight), sounds like it may just be a bad socket. I have a somewhat similar problem on a 1986 F150.