If you take the tail light apart you will see a thin piece of metal under a glued down oblong piece of plastic. The metal is what makes the connection to the bulbs. This metal may be rusted or broken. If so then you need to replace the tail light.
Check the ground wire connection.
Check the bulbs,if not the bulbs you most likely have a bad ground.
Do I need rubber like caps on new replaced bulbs in the dash
The taillights on a 1999 Kia Sephia are replaced through the cars trunk. Remove the plastic covers from the light housings and replace the bulbs.
have you checked the bulbs and fuses
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take out the bulbs and see if they are burned out.
If dash and parking lights do not work - check the fusesMay also be a bad headlight switchThe tail lights and brake lights on my 2002 would not work at the same time. Had to replace whole tail light assembly. Was told problems with jeeps-the circuit boards in older jeeps overheat and short out.
Check the fuses first then check the bulbs.
check the switch at the break peddle
If you are afraid of breaking something take it to a garage.
Bulbs cannot be replaced. Entire control module must be replaced.