I have a 2004 GMC Denali XL and the 3rd brake light has not worked for a while. I ordered a new one and installed it...but it doesn't work either. I checked the main fuse and its OK. I'm suspecting its not the light at all. WHAT ELSE SHOULD I CHECK??? Jeff
I received your 3rd brake light flash controller-fully adjustable ez fit kit. installed on my 2002 gmc sierra, power coming into box, good ground and unit is not working. third brake light works good with kit removed. any help would be appreciated. thank you for your time.
SOURCE: 1998 gmc sierra brake lights
did u check that they not burn?if not you should Check the wires going into the steering column if you don't have separate turn signal lights and brake lights because if they use the same bulb then the turn signal may be bad. If I remember correctly that particular car doesn't work this way, but I include it just in case.
SOURCE: Brake lights do not work
This is a well documented problem, replace the turn signal/multifunction switch to correct this issue, this very problem happened on my GMC, it is a 99 as well, replaced the switch as instructed by a chevy forum member and it fixed the problem
SOURCE: brake lights dont work
make sure your geetin 12v to brake switch if not jumper a wire then try it
SOURCE: 2005 Yukon XL, third brake light intermittent
Remove bulb, make sure it sits tight in the socket. make sure socket is not burnt up (brown or black in color) Check bulb, if the filament inside is loose or discolored, replace as nesessary. Check brake light switch under driver side dash above brake pedal. make sure it is adjusted correctly.
SOURCE: how do you remove the third brake light assembly
You'll have to gently apply some prying pressure to the housing as you turn the screws, it sounds like they've stripped the part they go in...
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