03 Tahoe brake lights will not work!

Do you have power to the brake light switch? If not check fuses and wiring. When you push the brake pedal does power flow out the other side? If not then you have either a bad switch or it is misadjusted. If you do get power then you have a damaged brake light circuit down the line from the switch. Wiring diagram time.

Are all the brake lights out? If the high mount stop light is the only one working, I'd suspect the turn signal switch. The high mount stop light is wired directly to the brake light switch. But the other two are wired through the turn signal switch. Hope that helps! Jim

G A, yes i have power to the switch, and when the pedal pressed down i have power flow. I will look at the wiring harness as see what i come up with. Jim, i ordered a turn signal switch and it will arrive tomorrow, i did test the lights and the top is the only one that worked. I will update with the fix later. Thank you both for your assistants with this issue

Okay sounds like your on the right path. Let us know your findings.

Yes, please keep us posted. Jim

I got the turn signal switch, installed it, tested the lights and everything is back to normal operation. It is amazing how some of these things are connected. You guys are awesome thank you again for your help on this matter and might i add your response time is very fast

That's great!! Very glad to hear that you fixed it!! Happy to help! Thank you for letting us know and for the kind words! Jim

Good news. Thanks for letting us know.