The brake light works the one on top,but the regular brake lights dont
Have you changed the bulbs?
As in the previous comments the brake switch wire goes to the turn signal switch and the third brake light. Since the 3rd brake light is working, the problem is in the turn signal switch. When the switch is centered, both brake lights have 12v to them. When you make a left or right turn, the switch has to switch connections between the turn signal blinker and the brake light circuit for the appropriate illumination of the proper light sequence. Buy a new turn signal switch and temporary plug it in. You will see the proper operation.
SOURCE: 2002 Trailblazer LS left rear
I have the same problem with my 2004 Trailblazer LT. Driver side brake light does not illuminate. All other lights work fine. Replaced bulbs. Still does not illuminate. Cannot figure out which fuse goes to this light. Could it be a fuse?
SOURCE: Brake lights don't work on 2006 trailblazer
check the little switch behind the brake pedal, known as a brake switch
SOURCE: REAR TURN SIGNALS WORK BUT MY BRAKE LIGHTS DONT
Replace the turn signal switch. If you want to prove this have someone stand behind the car with your foot on the brake. Then wiggle the turn signal lever. The brake lights should blink. This is a real common problem with W body. I have replaced two on my cutlass plus tons more at my shop.
SOURCE: 2003 trailblazer brake lights do not
Look for a bad common ground connection for the two lights. Modern cars seem to have a problem making secure long-lasting ground points. There may also be a problem with the turn indicator switch as both lights are run through that switch.
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