Brake lights not working

1999 GMC SIERRA
190,000 MILES • 5.3L • V6 • 2WD • AUTOMATIC
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TINA MARIE LOPEZ
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My sons truck is having issues with brake lights. All other lights work, blinkers work, we put a new brake switch in there and checked all the fuses. I don’t know what else to try besides wiring.
Aug 21, 2020 at 8:40 PM
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KASEKENNY
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Does the center high mount brake light not work either? I attached the information about the stop lamps on this truck. As you can see if the tail lamps and center high mount (third brake light) do not work then we have a switch or wiring issue from the switch to the fuse.

When you checked the fuse, did you check for power? Here is a guide on how to do that:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Clearly if the lamps are not working then we are not getting voltage to them so we need to track down where we have voltage and where we do not.

Run through this and let me know if you have power on both sides of the fuses when you press the brakes. Thanks
Aug 22, 2020 at 4:51 PM