[drv9568]

I have a question my brake light on my chevelle work fine when the lights are off, as soon as i turn on the headlights i have no tail lights at all, i have changed the headlight switch and the brake light switch and the problem is still there, need so help.

 

[d1_bradley]

I think you'll find that your turn signals are in the same boat. Try cleaning the sockets and the hole where they plug into real good. Use Scotchbrite pad or something similar and get everything clean and shiny. This will normally fix all rear lighting issues.