GMC Repair: no tail lights nor dash lights, vacuum line, buick century

Question
i have 94 buick century 6 cylendrs...all of a sudden my tail light is not working togther with the dash board light...head lights ar ok, brake lights are ok, and I tested all fuses ...thy seem to be ok too...any idea of what the problem may be? suggestion for treatment..
appreciate your help
Thanks

Answer
What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a vacuum line may have been knocked loose or a wire connection came loose, Look around in the area where work was performed.

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