I would start with the fuses,Check under the dash in the fuse box. Make sure all fuses are good. If there is a blown fuse then replace it, If the fuse blows then you may have a short in the wiring to tail lights, also check wire connections at the rear bumper area.
I have seen the connector go bad, test power going into and coming out of connector to tail lights. if there is a trailer hitch on this truck then check where the hitch wiring was connected , check for bad connections.
If the front park lights work then it may not be the light switch but rather a bad wire.Here is a wiring diagram to help you.
have a good day and i hope this is helpful. If there is something else i can help with please let me know.
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