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if the bulbs are good, then check the signal from the transmission range switch.you can check that at the bulb socket with the park brake set, the key on/engine off and put trans in reverse. use a test light and check power in the light socket. no power indicates bad fuse, bad wiring, or bad range switch.
Most likely a fuse is bad, get out your owners manual and see which one powers the lights. Buy a good test light and it will help you the rest of your mechanic career. Then you can test the fuses without pulling them out to look at them, and test them electrically. first to confirm they are indeed getting power and then that they are good.
do your front park lights work? if so then problem is at the rear first check your light bulbs could have had a serge in power and blown both of them . do you carry anything in trunk that could have cut the wiring harness?
Open the hood to gain access to the rear of the head light. simply unplug the light bulb, then twist then pull the bulb to remove. Do not touch the glass portion of the new bulb, the oils in your skin may cause the bulb to burn out quickly. reverse to install
Check the light bulbs. Sometimes if you by mistake insert the wrong light bulb, this happens. There are One Filament bulbs (for reverse) and Two Filament bulbs (for brakes and signals). Wrong placement provokes shorts.