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hey anyone who can help i would be great. my third brake light works but my tail brake lights dont work what could be the problem  already tried new bulbs and checked fuses and all other light work  they come on every once in a while

Does your truck have a trailer wiring harness or anything? The wiring to the CHMSL (third brake light) and the taillights is seperate. On pickups, most of the time a problem with aftermarket trailer wiring causes issues like this. If you don't have trailer wiring, check for power directly at the taillights and follow the harness back until you find another connector and check for power at that junction.

you might want to check its wiring, most of the people overlook this. hope i helped.