Break Lights HELP!!! NEED ADVICE

I recently purchased my first vehical which is a 2000 pontiac grand prix. However my break lights are not operating correctly. I still have the center break light in the rear window. I replaced bulbs and checked the fuses under the hood. Is there another fuse box in the car that i am not aware of? Help please. I don't have a vehical manual.

Thank you for your help. Please advice.
Chewy1313

Hey, I've got a 99 gp and i've got a fuse panel on both sides of the dash, one to the left of the steering wheel kinda and one on the passenger side where the door meets the dash (same as the driver side) another possibility is that the connectors for the lights somehow came unplugged? Or maybe a faulty brake light switch? Hope this can be helpful.

I just experienced this same problem.Emergency flashers didn't work either.Turned out both are routed thru turn signal assy stalk. Expensive repair as part was dealer only. Good Luck!!