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Dave,could you give a little more info,such as the year? Someone is sure to help.One of the first things to do is to make sure your grounding pints for the tail light sockets have been cleaned of all rust,dirt,and paint, and are making good solid contact with the chassis.Welcome to FTE.
Dave,I don't have any experience on your year truck,someone here in the 48-60 section might be familiar.It could be something simple as a blown fuse.You might also ask in the 61-66 section,or the electrical section.Good luck,Steve.