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Replace the backup light on the right side. Its most likely burned out. A blown fuse would cause both lights to not work. You might have bad wiring to that side. If you have access to a volt meter, have an assistant put your car in reverse while you check the voltage at the backup light socket. Make sure to tell your assistant to keep their foot on the brake pedal. Voltage should about 12 volts
If the other one is working then there is something wrong with the wireing between the two of them, or the connection in the light or the bulb contacts are dirty in the holder.
I would say that the backup light switch on the transmission is faulty, or the wiring to and from the switch. Most times if the backup lights do not work this is the root cause.
the backup light gets its power from the neutral safety switch on transmission.
\When you put vehicle in reverse it toggles the switch in the tranny to engage the backup lights.
if that plug has the wire broke off the backup lights will not work.
Tail light and backuo light are separate circuits. Backup light is under the control of the backup switch located on the shift lever or transmission. Thats why one might work right and not other. Most troubles of this type are due to poor ground connections Check again what you did to change the tail light assembly
Try checking out your light bulbs in parking and backup light locations. Sometimes when one bulb goes out or just comes loose, it stops the entire circuit from operating.
I had the same problem with a 91 mazda 626. turned out that the wires that ran from the lights along the trunk and back into the harness were broken from opening/closing the trunk. i would check around that area first.
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