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I think this may be the same problem these trucks have had for years take the taillight apart and check the circuts that go from the wireing to the bulbs dont know if this will help you also you can check the plug at the taillight to see if there is power there with the blinker on
Are you sure the right side bulbs all flash? You say you replaced all the bulbs? Why would you replace bulbs that were working? Did you have this problem before you replaced the bulbs, or after. The hazard flasher is down under the dash, left side, turn the signals on and follow the clicking noise.The hazard flasher and the turn signal flasher should be near each other, and are interchangeable. If it clicks fast, a bulb or a bad socket is usually the cause. These trucks have a lot of problems with the tail light circuit boards.
check all bulbs,inspect sockets for corrosion,rust ,or sighns of overload.follow wires and check connectors if all good ,replace the flasher ,,if that doesnt fix it ,the blinker switch in the steering coulmn would be next
The flasher on this vehicle looks nothing like the flasher's of yesteryear. It will be located behind the drivers side knee bolster(under the steering wheel). It will be a small black box that is about 3 inches wide, 2 inches deep, and 1 inch thick. It may be somewhat difficult to locate because on some of the GM trucks they actually hide it behind the guage cluster bezel but to the left of the guages. Let me know if I can help you any further.