I replaced the backup and turn signal lights with LED'S. Don't know why they are not working. The rear signal lights work.
No lights in the rear of the car at nite only the backup and rear signal lites work.Yeah, it's difficult to understand what's the issue, title says one thing, but first sentence is another thing. Ok, just to confirm you replaced LEDs in your turn signals front and back and the backup lights. Your LED turn signals are working, but your backup LED lights are not. If you already tried them switching 180 degree, the other issue I believe I also had with replacing backup lights is that light did not fit properly in the socket and/or didn't reach the contacts. So that might also be the case for the backup lights.