Hello ojuice44,
If the bulb are good the next place to look is to check the fuses, if your turn signals work the fuse will be good. The fuse for the back-up lights is the same one for the turn signal..
After that there are two areas to check.
First, check for power and ground at the bulb sockets if ground is good and no power go to next step. If no ground repair the ground circuit ( See diagram below).
Second,check for power to the gear selector switch. Check for power with the key on and engine off going into the switch on the dark blue wire (See diagram below) if no power repair that circuit. If there is power there, then with the key on and engine off put the gear selector in reverse and check for power at the light green wire if there is power there the switch is good if no power replace the switch. If you do have power at the light green wire coming out of the switch repair the light green circuit from there to the taillights.
I hope this helps.
Regards,
netvan
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