From inside the trunk looking up at the light First, gently work the gray, carpet like cover loose from the area around the tail light ,(this may give you a little trouble). Once you have done this, you will see three silver nuts. These must be unscrewed. The lower left nut must be accessed through a hole next to where the trunk lid fits. (The screws are permanently attached to the lens housing so will not drop into obscurity when the nuts are removed). After removing the nuts, GENTLY work the lens housing away from the car. You may need a screw driver to unseat the housing, but just be gentle.
You will find three bulbs inside the lens. The brake light bulb is on the lower right side. Simply pull the old bulb out and insert the new one.
Just reverse these directions to reassemble the housing.
SOURCE: brake light on 2001 chevy blazer LT 2wd
When my blazer did this they had to replace part of the wiring harness in the steering wheel. It took forever for them to get the parts because we live in nowhereville, but once it was in it works again and no problems. I had to take it to the actual chevy dealer because none of the other places had a clue. good luck.
SOURCE: 2005 Toyota Sienna rear brake light problem.
have you checked the earthing continuity-if it's this other bulbs may also partly light when brakes used
otherwise-
Check continuity of live from center to lh & rh lights and/or is there a live at those lights
SOURCE: My third brake light dosen't work on my chevy s10 94'
I had a similar problem with my 1994 S-10 LS extended cab. Both tail brake lights worked fine. I removed the 3rd brake light cover and tested for voltage at the steel center of the two rivets and found the positive (driver side) negative (passenger side) were good. I checked the two metal strips that send power to bulbs and found the positive side was open. Seems the flared side of the rivet was not making contact with the metal strip. I bucked the rivet with a punch and hammer and it took care of the problem.
SOURCE: 2002 Chevy Blazer, rear brake lights do not work
I had a similar problem and when i went to the auto electric place the guy said its a brake switch next to the brake pedal which is not working. He took it out and fixed it. Now its all fine.
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