Emergency flashers do not work on 1996 C1500. Drivers side rear turn signal and brake light also do not work.

Very possibly bad wiring but may be flasher siloniod have you made sure the bulbs are good right test the wire and make sure it is getting power to the rear turn signal most of the time the are separte from hazzards but on this truck i think it is together

That's a one piece set up in the steering column. The signals, hazards and the horns power run through it. If you have horn, you have power. The whole module may be bad. It's very easy to change. A repair book would make that change effortless.