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How can i fix a 1999 Pontiac sunfire that the tail lights and brake are not working but daytime runners back window light works what is wrong?

Here are some additional items that you can check beyond checking the brake light switch:

- Check the voltage at the tail light sockets to ensure the tail light bulbs are receiving power

- Check the trailer light connector's wiring for signs of corrosion

- Inspect the tail light assemblies for damaged wiring

- Check the taillight relay