The high mount brake light works, flashers work and, all lights work when turned on. just the bake lights when peddle is pressed
If the high mount light works, and you know the bulbs are good, the problem is probably in the turn signal switch.
SOURCE: brake lights/rear turn signals
I had the same problem with my 1999 Yukon. The electric board needed to be replaced. Rust starts to build up and shorts out or blows the bulb. The dealership charged $73.60 for the part and I installed it myself (Saved $30).
SOURCE: Brake lights quit working.
if all fuses and bulbs are ok get to the brake switch and see ifits stiff or stuck, if it just has two wires on it you could join themtogether to see if the brake lights come on though obviuosly dont leave them joined.Good luck davelee
SOURCE: 1999 GMC Suburban, K1500 4WD. Top brake light bar
third light is different circuit. saftey reason check fuses grounds wires
SOURCE: brake lights won't work. tail lights do. I
need to know if your third brake light up high is working or not.if it isn't,you need to check the brake light switch on the brake pedal with a test light,one side hot all the time,the other side should turn hot when brake pedal is pushed.
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