Third brake lite works but cargo won't good bulbs and fuse
The cargo light will only work if the lights in the cab are on. Turn them on then flip the switch for the cargo light and it should come on, if not then it is probably an electrical problem.
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: 98 gmc suburban brake lights
One of two things cause this corroded or poor chassis earth at the bulb holders or the circuit board that holds the bulb is faulty.
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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